r/technicallythetruth • u/NomadDiver • Oct 20 '21 • 1 26 29 27 25 1

Only people good at math will get this one.... and its actually funny. TTT approved!

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## u/BJK5150 Oct 20 '21 •

When we were learning this, our teacher would yell the numbers (due to the “!”). And that’s the only reason I remember this particular topic.

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## u/leu_teu_cu_eh_meu Oct 21 '21

thanks, now i get it,

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## u/C-Human Oct 21 '21

I get it. It ain't funny but I get it.

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## u/G_Affect Oct 21 '21 edited Oct 21 '21 •

It is not 5? I still dont get this

Edit: right i remember this. Never have i used it in the real world.

5 x 4 x 3 x 2 x 1 = 120

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## u/magnum_donut Oct 21 '21

I mean you can calculate your chances of getting four cards in poker with factorial

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## u/G_Affect Oct 21 '21

In all the years of math i have taken, i have never taken a statistics class..

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## u/Onion-Much Oct 21 '21

You might want to pick up a introduction, it's fairly easy and next to geometry probably the most practical math.

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## u/dyingpie1 Oct 21 '21

That’s like algebra

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## u/SammySquareNuts Oct 21 '21

It is not 5? It is 5!

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## u/[deleted] Oct 21 '21

[removed]

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## u/TheVoidlessOne Oct 21 '21

Wait a ! means something else in math?

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## u/ClearBrightLight Oct 21 '21

Yup! You multiply the number before it by (n-1) repeatedly until you get to 1. So 5!=5x4x3x2x1. 10!=10x9x8x7x6x5x4x3x2x1.

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## u/TheVoidlessOne Oct 21 '21

I do not look forwards to have tests on this. Dosent seem to conplicated just irritaitng like if the number whould be 1000! It whould take a year

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## u/6ixpool Oct 21 '21

You're allowed to use calculators (it has the "!" button on there somewhere). Its mainly used for calculating probabilities and such.

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## u/Khoyoulfaz Oct 21 '21

You probably won't have "tests" on that. It's mainly a way to write that opération in a simple manner, rather than a thing that you must calculate.

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## u/tanya6k Oct 21 '21

I'll be the first to admit that I was focusing on the wrong exclamation point and could not figure it out for several minutes.

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## u/whatsthisevenfor Oct 21 '21

Oh quit being a fun-sponge.

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## u/HalfSoul30 Oct 21 '21 •

A humor tumor

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## u/JunkCrap247 Oct 21 '21

a chuckle carbuncle

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## u/KingMRano Oct 21 '21

a Debbie downer

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## u/Whats-Up_Bitches Oct 21 '21

A disgruntled dave

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## u/brownbob06 Oct 21 '21 edited Oct 21 '21

A negative Nancy

Edit: You guys really went off the rails after this

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## u/xantub Oct 21 '21

I can see a tiny bit of funniness if someone comes and says "that depends on the order of operation!" and you tell them "nope, the answer is either 5 or 5!". Nah, still not funny.

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## u/Aerodrache Oct 21 '21

“Actually, order of operations only affects how loud the five is.”

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## u/Chmichonga Oct 21 '21

Likewise! I thought it was hilarious when we were learning about factorials.

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## u/jvctheghost Oct 21 '21

I remember a classmate yelled “4!” with such enthusiasm when our teacher wrote it on the board and asked if anyone knew what it was. Core memory right there.

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## u/WeastBeast69 Oct 21 '21

When I was in deterministic operations research there was a formula that used b and B so my professor would yell for B and talk quieter for b when talking through the formulas

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## u/[deleted] Oct 21 '21

[removed]

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## u/VaughnanB Oct 21 '21 •

5!=1×2×3×4×5

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## u/oftenGetsItWrong Oct 21 '21 •

What kind of monster writes factorial products in increasing order?

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## u/Bucolique Oct 21 '21

That’s interesting because the english wikipedia defines it using decreasing order while the french (my language) defines it using increasing order and I’ve always seen it defined that way during my education. Seeing it defined decreasingly seems pretty unusual to me!

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## u/Thathitmann Oct 21 '21

Yeah, well the French have never done anything for math!

Except, like, inventing factorisation and working on infinitesimal calculation and proving infinitesimal calculus, and expanding Newtonian polynomials. And making Pascal's triangle, and Pascal's law, and Pascal's theorem.

Oh, and inventing calculators.

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## u/Googelplex Oct 21 '21

Alright, but

appartfrom the factorisation, infintesimal calculations, Newtonian polynomials, Pascal's triangle, Pascals's law, Pascal's theorem, and calculators.......what have the French ever done for us!

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## u/l4mpSh4d3 Oct 21 '21

Apparently quite a few people in this thread. This is making me very uncomfortable.

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## u/noblest_among_nobles Oct 21 '21

Yeah, normally people write it like: 5!=2×4×5×1×3

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## u/[deleted] Oct 21 '21

Why do people multiply it by one at all?

It's like that extra step...120 x 1...120, solved it!

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## u/cori_irl Oct 21 '21

This is probably more info than you actually wanted to know, but this is already a post for math nerds, so why not.

There are a few factors: - One of the properties that these math operations (usually called functions) have is that they have some possible inputs, and some other possible outputs. The function is supposed to be like a little robot - as long as you give it a valid input, it does some specific set of steps, and gives you an output. It’s not smart - it does the exact same steps for every input. So if we omit the “multiply by 1”, what happens if we give 1 as the input? Our function would be something like “Multiply the input number by all of the integers less than the input, but greater than 1.” But if our input is 1, there are no such numbers, so the function breaks. - To fix this, you could define the function as having specially defined outputs for certain values. So we could omit the “multiply by 1” step, and just say 1! = 1 because we say so, and all numbers greater than 1 follow the normal factorial pattern. But this strategy gets complicated for more complex functions - what if you accidentally miss one of the special cases and don’t give a definition? - so it’s only used in limited circumstances (like the Fibonacci sequence, for example). - You could argue that all these protocols are only necessary if you’re actually a mathematician using fancy functions, and it’s overkill for something simple like factorial. But man, math people hate inconsistency. It’s dangerous in their field. All complicated math is built out of simple math, and if you’re not careful about the simple stuff, you’ll mess up the complicated stuff. It’s a habit that math teachers try to instill early on.

So, that’s why we always write the 1 in factorials.

tl;dr: Mathematicians break out in hives if they encounter ambiguity.

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## u/ru_benz Oct 21 '21

I appreciate that you used a proper multiplication symbol rather than an "x" -- most people wouldn't put in the effort.

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## u/7937397 Oct 21 '21

I just use *

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## u/SaftigMo Oct 21 '21 edited Oct 21 '21

Fucks with formatting on reddit.

Edit: Guys I know you can circumvent the formatting, but it's a hassle.

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## u/Tandemdonkey Oct 21 '21

5•4•3•2•1

There, the superior method

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## u/[deleted] Oct 21 '21

[deleted]

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## u/CatAteMyBread Oct 21 '21

5(4)(3)(2)(1), because I can save time on that first bracket

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## u/ShrimpNooodle Oct 21 '21

5(4)3(2)1

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## u/Fatalchemist Oct 21 '21

5 times IV × (3) * two • -(-1!)

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## u/Betonmischa Oct 21 '21

Change -(-1!) to 4728282263738291627383933928281727273383833949484373822818238448373734747474844747382828347463738394058588918229394869917366459503727127395696971728494048287161829394958271929460607097264859682739202838595917496959

^{0}for maximum efficiency

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## u/LimpWibbler_ Oct 21 '21

5 times IV × (3) * two •| -(-1!)|

^{2}I added a bit more to the one. Give it some more flair cause you can just fuck with 1, he is such a tool.

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## u/No_Bodybuilder_818 Oct 21 '21

Yep this is way. x could mean cross product whereas a dot means dot product.

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## u/gjvnq1 Oct 21 '21

S(S(S(S(S(0))))) × S(S(S(S(0)))) × S(S(S(0))) × S(S(0)) × S(0)

×[S[S[S[S[S[0]]]]] S[S[S[S[0]]]] S[S[S[0]]] S[S[0]] S[0]]

(× (S (S (S (S (S 0))))) (S (S (S (S 0)))) (S (S (S 0))) (S (S 0)) (S 0))

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## u/FryCakes Oct 21 '21

5 doesn’t equal 1x2x3x4x5?

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## u/jericho-sfu Oct 21 '21

The “!” symbol has meaning. It signifies a factorial. It means multiply that number by every positive integer from one to the number. So, 4! is 1*2*3*4, and so on

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## u/FryCakes Oct 21 '21

Yes I know I was just making a joke because in programming != means “not equal to”

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## u/Mrorange002 Oct 20 '21 •

Well shit that’s clever

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## u/noothersinvolved Oct 21 '21

Why is it clever? What am I missing?

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## u/nightfury2986 Oct 21 '21 •

It's not 5, it's 5!

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## u/immadee Oct 21 '21

Ah! 5 factorial. Holy shit I forgot those existed

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## u/DaringSteel Oct 21 '21

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## u/supermassiveanus Oct 21 '21

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## u/[deleted] Oct 21 '21 edited Oct 21 '21

[removed]

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## u/barbarianbob Oct 21 '21

That...that's gonna stay blue.

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## u/jdgoodwin66 Oct 21 '21

I hate that you typed it. I hate that I clicked it. I hate that it exists. I now hate you.

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## u/theswedishsnake163 Oct 21 '21

That exists. But why

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## u/minecraft_min604 Oct 21 '21

Because people like you are suckers to your curiosity, leading to people being scarred for a while

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## u/0_MysterE_0 Oct 21 '21 •

The fuck is a factorial.

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## u/ASHDABOSS32 Oct 21 '21

Essentially putting a ‘!’ after a number means you multiply by the numbers below it. Eg: 3! is 3x2x1 or 4! Is 4x3x2x1 and 5! Is 5x4x3x2x1(which is 120... the actual answer)

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## u/I_phollow_chom0s_22 Oct 21 '21

Moments like these are what I miss most about pre 2016 reddit

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## u/ban-me_harder_daddy Oct 21 '21

Yep seriously

now days its just human drama outrage porn that is constantly upvoted. The disgruntled youth have taken over.

I have to block a new outrage porn subreddit every week.. the content for this website has definitely drastically changed

(I have absolutely no urge to argue with anyone about this. I'm just going to ignore you if you if your reply is argument.)

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## u/Funniestpersonhere Oct 21 '21

Shit, I guess I have a lot ahead of me for math, because I have no fucking idea what a factory oral is.

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## u/ACStitchesFan Oct 21 '21

! means factorial in math

5! = 5x4x3x2x1 = 120

230-220 x 0.5 = 120

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## u/noothersinvolved Oct 21 '21

Oh… I see. Yes, this is technically the truth. It is also true that I am disappointed. I was expecting more.

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## u/[deleted] Oct 21 '21

The joke is actually supposed to be that the answer is correct whether you do the problem correctly or not. If you take the order wrong and go left to right, you can just take the "!" as an exclamation mark and the ans will be 5. If you do the problem correctly, you can take the "!" as factorial and the ans will be 5!=120.

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## u/Kamran_Santiago Oct 21 '21 edited Oct 21 '21

I thought he's trolling at first. That shit was fucking smart. I feel bad for not realizing it. I kept thinking "MOTHERFUCKER, PRODUCT SUPERCEDES ADDITION". But the answer was in GRAMMAR.

Edit: I just told GPT-3's davinci-insturct to "Calculate 5!"... Here's what it gave me:

5! = 5x4x3x2x1 f×t÷k 5×5÷1

Motherfucker, am I dumber than an AI?

PS: If you're interested, I can instruct GPT-3 to do 3 things, and 3 things only because my boss'll kill me if I use up the tokens. Ask and you shall receive.

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## u/nightfury2986 Oct 21 '21

Wow I was just messing around with GPT-3 And GPT-J at work earlier today, wasn't expecting it in a random Reddit thread too

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## u/Kamran_Santiago Oct 21 '21

I have access to it through the company I work for. I just made a function that scrapes an article, summarizes it using Google's T5, selects random sentences from it, feeds the summary and random sentences to curie-instruct saying "Generate 10 concise, etc titles for this article etc" and the results were stellar. I wonder how well davinci-instruct would do.

I think GPT-3 is much better than GPT-J.

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## u/mudkripple Oct 21 '21

Makes sense if you're v smart, or if you're v dumb.

If you are in between like me, you need to read the comments section to understand :'(

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## u/infinitemonkeytyping Oct 21 '21

Is that in between defined by "remembered BODMAS, forgot factorials"?

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## u/Justonian_ Oct 21 '21

Is BODMAS just PEMDAS but with different letters? Then you won't be able to remember it by "Please Excuse My Dear Aunt Sally"

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## u/max-bants Oct 20 '21

The answer is 120, i don't get it.

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## u/89erMerun Oct 20 '21 •

1x2x3x4x5 = 120

5! = 120

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## u/max-bants Oct 20 '21

Yeah, this is way over my head. I know math because i have to, i don't enjoy it enough to get the jokes.

Edit: for fuck sake, i got it. I haven't used factorials in aeons.

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## u/Ecstatic-Appeal-5683 Oct 21 '21 •

You haven't used factorials in years, but you know how to do your taxes right? Or balance a checkbook? Or count back change? Or that the mitochondria is the powerhouse of the cell?

Gobbless the American school system. s/

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## u/imdefinitelywong Oct 21 '21

This is it. That moment they told us in high school where one day, algebra would save our lives.

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## u/OldDogTry Oct 21 '21

I mean, algebra is legitimately useful on a day-to day basis. Trig and calc are almost never useful unless you have a job that uses them.

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## u/[deleted] Oct 21 '21

It's also useful in developing logical thinking. Like I won't tell everyone to major in mathematics (because I sure as shit want to tell my past self not to do it) but 10th class mathematics is such a basic level that you really shouldn't give up on it unless you have some actual difficulties.

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## u/Intelligent_Moose_48 Oct 21 '21

Math is another language, and people who don’t speak it are innumerate the same way people who cannot read are illiterate

Learning math definitely changes how your brain processes things, the same way learning Spanish does.

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## u/npsnicholas Oct 21 '21

The ability to problem solve is more important than the actual math. Also I use trig and calc all the time in dungeons and dragons.

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## u/[deleted] Oct 21 '21 edited Oct 22 '21

[deleted]

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## u/Contemplatetheveiled Oct 21 '21

you cannot measure or understand reality without math.

Yeah, tons of people are never going to use it. Have you seen that guy going around and asking people what a quarter of an hour is?

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## u/jXian Oct 21 '21

Oh no. How many people say 25 minutes?

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## u/Contemplatetheveiled Oct 21 '21

More than you will be comfortable with. College students and college grads. People simply don't care.

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## u/Hist_Warshiper_Btw Oct 21 '21

Wtf are factorals? Im in 8th grade accelerated math incase u want to know

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## u/stifflizerd Oct 21 '21

It's easier to show than explain. An exclamation mark denotes a factorial.

3! = 3x2x1

6! = 6x5x4x3x2x1

4! = 4x3x2x1

11! = 11x10x9x8x7x6x5x4x3x2x1

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## u/Anjelwithglasses Oct 21 '21

Why are factorials important? I totally do not remember this lesson.

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## u/Chequita69 Oct 21 '21 edited Oct 21 '21

They're used mostly in "combination" problems. Like how many ways can you arrange a deck of 3 cards? For 1st card, it can be any one of three. For the second, it'll be one of the two remaining because one card we already put in 1st position. And the third one will be the last remaining card.

That means we have 3 choices for 1st position, 2 for 2nd and 1 for third. Once you have this information, you can multiply them together to get the number of possible combinations. 3x2x1 = 3! = 6 different combinations.

Now if you had to figure out how many combinations you can have of a full deck of cards, with all 52 of them? Answer would be 52!.

Edit: Technically, it's actually "permutations" where we find out the number of ways in which we can arrange any or all things from a set of stuff, not combinations. Combination is how we choose things or subset/group of things from a set of stuff, mathematically speaking.

I guess it's been really long for me as well. Permutations and combinations were always taught together, I forgot that mathematically they're related but different.

Permutations takes ordering of stuff into account. Combination doesn't. Like, vanilla and chocolate is a combination but it isn't any different from chocolate and vanilla. So they're not really different combinations but they are different permutations.

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## u/Dustin- Oct 21 '21

The most important reason for them to exist is because they describe how many ways things can be arranged.

Imagine you have three different types of coins sitting on a table in a row (try this at home if you want). How many unique ways can you arrange them?

The answer is pretty simple: the first coin can go into any of the 3 places in a row, the second coin can only go in 2 places because the first coin filled one, and the last coin only has one spot left for it to go. So the total possible ways to arrange the coins is 3x2x1 = 6 ways.

Factorials also get

hugereally quickly. 10! is already more than three million. 52!, which is the number of ways you can shuffle a deck of cards, is so unbelievably huge that it'svirtually guaranteedthat no two fair shuffles have ever been the same in the history of mankind.Edit: wow someone wrote almost the exact same comment a few minutes before me. That's wild lol.

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## u/SkaTSee Oct 21 '21

used in permutation and combination formulas or something if my memory of high school serves

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## u/sunsmoon Oct 21 '21

Factorials show up in statistics, calculus, and a handful of other places. Two of the big, early places you'll see factorials are in the binomial theorem/binomial coefficients ("n choose c" - high school algebra / pre-calc) and binomial distribution (high school/intro statistics).

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## u/K_a_n_d_o_r_u_u_s Oct 21 '21 edited Oct 21 '21

“!” after a number means it is a factorial. A factorial is the multiple of all integers lower than or equal to it. 2! = 1* 2 = 2. 5!=1* 2* 3* 4 *5=120. 0!=1 because reasons

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## u/010011100000 Oct 21 '21

Those things are literally the reason you learn math. Doing your taxes is just simple arithmetic and a bit of reading.

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## u/Trollin3915 Oct 21 '21

5! Is also know as 5 factorial which is the same as 1x2x3x4x5 is equal to 120 which is also the answer to this problem. Factorials (x!) are just 1x2x3x4x5x6... until that last number is x. Factorials are used in finding the amount of different arrangements a certain amount of things can have when they are all placed down at once such as finding the amount of different possible seating arrangements at a school when all the kids are there.

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## u/quackl11 Oct 21 '21 edited Oct 21 '21

5!=5 factorial which is that number times every whole number below it until 0 not including 0

Edit: u/possibleoatmeal just gave a very good defenition below me and the proper defenition, please use his defenition over mine

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## u/NomadDiver Oct 20 '21

You're on the right track... there's still something missing in your logic.

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## u/Trollin3915 Oct 21 '21 •

For those of you that don't 5! Is also know as 5 factorial which is the same as 1x2x3x4x5 is equal to 120 which is also the answer to this problem. Factorials (x!) are just 1x2x3x4x5x6... until that last number is x. Factorials are used in finding the amount of different arrangements a certain amount of things can have when they are all placed down at once such as finding the amount of different possible seating arrangements at a school when all the kids are there.

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## u/Profteach Oct 21 '21 edited Oct 21 '21

If you do it wrong it’s 5, but if you do it right it’s 5!

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## u/frozoberg Oct 20 '21

230-220=10 10*.5=5

So people who are really good at math, and people who are really bad at math both get the correct answer :)

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## u/septembervirghoe Oct 21 '21

My dumbass did this and then when i saw the comment the fact that i didnt count the !...

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## u/Hevysett Oct 21 '21

I legit don't EVER remember learning about factorials. But I peaked with geometry so...

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## u/Afraid-Goat-1896 Oct 20 '21

assuming the X is the multiplication symbol, order of operations means that you would do 220 x 0.5 = 110. so then 230 - 110 = 120. what am i missing? or is this a troll post?

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## u/Jeramus Oct 21 '21 edited Oct 21 '21

5! means 5 factorial. 5 factorial equals 5 x 4 x 3 x 2 x 1 = 120

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## u/Singular1st Oct 21 '21

Omg. That is genius. I totally overlooked factorials it was so smooth

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## u/notsurethisisright Oct 21 '21

what is a factorial

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## u/Loading0525 Oct 21 '21

Factorial means you multiply said number by all whole numbers below it until you reach 1, and factorial is written by adding an exclamation mark after the number. So 3! Is 3x2x1=6, 4! Is 4x3x2x1=24, 5! Is 5x4x3x2x1=120, etc.

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## u/Jeramus Oct 21 '21

The only non-intuitive thing to remember is that 0 factorial is 1. A factorial represents the number of ways to represent the elements in a set. 0 has 1 possible arrangement so 0 factorial is 1.

https://www.thoughtco.com/why-does-zero-factorial-equal-one-3126598

Factorials are commonly used in discrete math. https://mathworld.wolfram.com/DiscreteMathematics.html

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## u/odraencoded Oct 21 '21

factorial represents the number of ways to represent the elements in a set

Ah, so that's what it's for!

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## u/Jeramus Oct 21 '21

Think about all the possible ways to shuffle a deck of cards. That can be calculated with a factorial. 52! is a very large number.

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## u/scwizard Oct 21 '21

Ahh that's clever. If you do the order of operations wrong the answer is 5 but if you do the order of operations correctly the answer is 5!

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## u/j3278 Oct 21 '21

This is much more intelligent than the versions of this that plague Facebook.

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## u/OG_PapaSid Oct 21 '21

I thought I was bad at math for a second, which confirmed I'm actually bad at math

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## u/realnelster Secret Technique Oct 21 '21

Ok but for the linguists out there, can this be classified as a pun?

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## u/Lilsammywinchester13 Oct 21 '21

That would explain why I groaned out loud at the dadjoke energy of this post haha

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## u/TER0KN0R Oct 20 '21

I'm not good at math but isn't it 120? I'm dumb but I'm sure your right

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## u/Nginda8 Oct 20 '21

5! Means 1x2x3x4x5 which is 120, the ! Means times all the numbers before it together for example 3! = 1x2x3 = 6

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## u/marymoonu Oct 21 '21

No fair. We don’t combine English and maths.

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## u/Baby-cabbages Oct 21 '21 •

I have a shirt that says “English is important but math is importanter.”

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## u/Illustrious-Total489 Oct 21 '21

When I got it I pointed at the 5! on the screen like i had just caught it eating my leftover chinese food

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## u/baxbooch Oct 21 '21

Y’all need r/unexpectedfactorial in your life. I got it right away.

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## u/SituationSouth368 Oct 21 '21

I don’t get it

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## u/Giric Oct 21 '21 edited Oct 21 '21

220 x 0.5 = 110.

230-110 = 120.

5! = 1*2*3*4*5 = 120

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## u/Wannabedankestmemer Oct 21 '21 •

Factorials people, Factorials

5! is 120

This is technically the truth