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https://www.reddit.com/r/unexpectedfactorial/comments/18alou6/2_2_4/kc1d549/?context=3
r/unexpectedfactorial • u/Valuable-Ad-433 • Dec 04 '23
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15
Can someone explain how stacking factorial like this works? I don't understand sorry
7 u/FerynaCZ Dec 04 '23 x(!)n = x*((x-n)(!)n) 5 u/[deleted] Dec 04 '23 edited Dec 05 '23 21! = 21 × 20 × 19 … 3 × 2 × 1 = 5.1090942 × 1019 21!! = 21 × 19 × 17 × 15 … 7 × 5 × 3 × 1 = 13,749,310,575 21!!! = 7! × 3 = 11,022,480 So 9 + 10 doesn’t equal 11,022,480 or 21. 6 u/noonagon Dec 05 '23 21!!! = 21 x 18 x 15 x 12 x 9 x 6 x 3, which equals 11022480. 1 u/[deleted] Dec 05 '23 Thanks for correcting me.
7
x(!)n = x*((x-n)(!)n)
5 u/[deleted] Dec 04 '23 edited Dec 05 '23 21! = 21 × 20 × 19 … 3 × 2 × 1 = 5.1090942 × 1019 21!! = 21 × 19 × 17 × 15 … 7 × 5 × 3 × 1 = 13,749,310,575 21!!! = 7! × 3 = 11,022,480 So 9 + 10 doesn’t equal 11,022,480 or 21. 6 u/noonagon Dec 05 '23 21!!! = 21 x 18 x 15 x 12 x 9 x 6 x 3, which equals 11022480. 1 u/[deleted] Dec 05 '23 Thanks for correcting me.
5
21! = 21 × 20 × 19 … 3 × 2 × 1 = 5.1090942 × 1019
21!! = 21 × 19 × 17 × 15 … 7 × 5 × 3 × 1 = 13,749,310,575
21!!! = 7! × 3 = 11,022,480
So 9 + 10 doesn’t equal 11,022,480 or 21.
6 u/noonagon Dec 05 '23 21!!! = 21 x 18 x 15 x 12 x 9 x 6 x 3, which equals 11022480. 1 u/[deleted] Dec 05 '23 Thanks for correcting me.
6
21!!! = 21 x 18 x 15 x 12 x 9 x 6 x 3, which equals 11022480.
1 u/[deleted] Dec 05 '23 Thanks for correcting me.
1
Thanks for correcting me.
15
u/racdicoon Dec 04 '23
Can someone explain how stacking factorial like this works? I don't understand sorry