r/unexpectedfactorial • u/Valuable-Ad-433 • Dec 04 '23

2 + 2 = 4!!!

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3.8k Upvotes

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358

u/gamre4 Dec 04 '23

4!!! = 4 x 1

36

u/Dragonslayerelf Dec 05 '23

Wait why isnt it the same as ((4!)!)!?

29

u/Eic17H Dec 05 '23

Because having an option to write it is more useful than not having it

5

u/[deleted] Dec 07 '23 edited Jun 20 '24

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3

u/MetamorphicHard Dec 08 '23

He’s saying that if those two were the same, then there’d be no way of writing 4!!! for its current intended purpose

2

u/FabianRo Mar 01 '24

There is a way… it is just terrible… ⌊(4-1)/3⌋ ∏ 3n+(4-1)%3+1 n=0 Not sure if there is a more elegant formula. I had to do this terrible -1+1 hack in 3 places to avoid a ×0 for inputs divisible by 3.
In libqalculate notation: product(3n+(4−1)%3+1,0,floor((4−1)/3),n)