Permutations/Derangements: Difference between revisions
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The subfactorial of 20 is 8.950146311929e+17</pre> |
The subfactorial of 20 is 8.950146311929e+17</pre> |
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=={{header|Mathematica}}== |
=={{header|Mathematica}}/{{header|Wolfram Language}}== |
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<lang Mathematica> |
<lang Mathematica> |
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Needs["Combinatorica`"] |
Needs["Combinatorica`"] |
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