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RPermutation.md (281B)

      1 # r-Permutations
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      3 TB 6.3
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      5 **Definition:** r-Permutations are permutations that have a lenght of r.
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      7 An important functions is P(n, r) where this denotes the number of r-permutations of a set with a length of n.
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      9 The formula for P(n,r) is as follows:
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     11 $P(n,r) = \frac{n!}{(n-r)!}$.