Subfactorial, a recursive approach

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Derangement

recursive formula of subfactorial

Subfactorial of 4

deragement of 4

recursive formula of derangements

Number of ways to exchange Christmas Gifts

Zero subfactorial

Subfactorial

a recursive approach

Автор: blackpenredpen

Загружено: 2018-11-13

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In how many ways are there that we can do gift exchanges so that no one gets his/hers own gift back? Watch and find out this "derangement" concept! #derangement #ChristmasGift

Check out !0,    • 0!=1 and !0=?
Zero subfactorial

Derangement, recursive formula of subfactorial, https://brilliant.org/wiki/derangements/

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Subfactorial, a recursive approach

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