chandra sekaran on Sat, 25 Jun 2016 05:51:45 +0200

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Need permutation help for n!/(n-r)!

numtoperm(n,k) will give  k-th permutation for n!.
Any function for n!/(n-r)! available?

For n!/(n-r)!, Let n = 50 and r = 3. 
If we define r as subset say [2,3,5] i want
calculate the number where [2,3,5] occur and reverse also.

Any direct function available and if not how to calculate.


Chandrasekaran B