EMPTY

Friday, 22 September 2017

Problem... Subfactorial




#Permutations #Factorial #Subfactorial #Derangements
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1 comment:

  1. Keagan Lato7 September 2026 at 13:57

    Subfactorials are such a satisfying rabbit hole - the derangement connection feels like a magic trick the first time you count it out. Nice problem framing for the classroom.

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