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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Permutations-Derangements/Mathematica/permutations-derangements.math Normal file
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Needs["Combinatorica`"]
derangements[n_] := Derangements[Range[n]]
derangements[4]
Table[{NumberOfDerangements[i], Subfactorial[i]}, {i, 9}] // TableForm
Subfactorial[20]