Irksome Declaration

20 June 2009

In looking for an established notation for a particular sort of permutation, I have run across a large number of tutorials that declare that the notation and formula for a permutation is

nPr = n! / (n - r)!
This claim complete confuses the concept of a permutation with the count of possible permutations. It's rather like saying that an American is 306,719,000.

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