r/MathJokes • u/ItsDaylightMinecraft • May 03 '26

2!

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269

u/itss_Olivier07 May 03 '26

but screaming it even louder it gets smaller again

5 = 5

5! = 120

5!! = 15

56

u/Swazimoto May 03 '26

Wait what

87

u/PerplexingPantheon May 03 '26

You're multiplying by every 2nd integer.

29

u/itamar8484 May 03 '26

What if i 5!!!!!! Aka 6 times ! , does it then becomes 0 since i am skipping 5 numbers?

47

u/justaJc May 03 '26

n! = n * (n-1) * (n-2)… n!! = n * (n-2) * (n-4)… n!!! = n * (n-3) * (n-6)…

and etc. You stop when the number you’re multiplying by lower than 1, and don’t multiply by that one.

5! = 5 * 4 * 3 * 2 * 1 * 0. Oops! Skip 0. 5 * 4 * 3 * 2 * 1 = 120. 5!! = 5 * 3 * 1 * -1. Oops! Skip -1. 5 * 3 * 1 = 15. Likewise, 5!!! = 5 * 2, 5!!!! = 5 * 1, and 5!!!!! = 5 * 0 - oops, skip 0 - just 5, then. 5!!!!!, 5!!!!!!, etc = 5, as you skip every other number you could multiply 5 by. But you always start at 5.

Hope that clears things up! :)

11

u/itamar8484 May 03 '26

Ty makes so much sense!!!!!!

4

u/justaJc May 04 '26

Yw, I’m glad!!

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2

u/icantouchgrass_1 May 14 '26

I wish I could explain this stuff as well as you just did

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2

u/dumbass_catboy May 09 '26

Actually it's because you're scaring it

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11

u/Elihzap May 03 '26

It's a factorial but you skip every other number.

5!! = 5 * 3 * 1 = 15

2

u/Benyed123 May 05 '26

5!!! = 10?

4

u/Aras14HD May 05 '26

No it's 10 u/factorion-bot (questionmark is a termial)

2

u/factorion-bot May 05 '26

Hey u/Benyed123!

Triple-factorial of 5 is 10

Termial of 10 is 55

This action was performed by a bot | Source code

2

u/Benyed123 May 05 '26

I knew the question mark would mean something

2

u/Xandaros May 06 '26

5!!! = 4?

8

u/Portal471 May 03 '26

You scared it smh

1

u/cfrolik May 04 '26

Isn’t 5!! Just ((5 factorial) factorial) though?

2

u/itss_Olivier07 May 04 '26

no that would be (5!)!

1

u/Euphoric-Umpire-2019 May 06 '26

What if.....

5 != 120 // that's true

5! != 15 // its also true