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What is the procedure of finding the last non-zero element in ${^n\!P_k}$?

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Related. –  Gigili May 27 '12 at 14:16
Is nPk a short hand for $n! / k!$? or perhaps $n! / (n-k)!$? I am guessing based on your tag that this is about permutations. –  Willie Wong Jun 12 '12 at 7:51

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