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Subfactorial - Statistics How To
Subfactorial - Statistics How To
subfactorials
Formula for the number of derangement of a derangement? - Quora
dℝ∅ℕ∋ on X: "@fermatslibrary The nth subfactorial is the number of permutations of n objects in which no object appears in its natural place. Long story short: it's alternating series of permutations.