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ELEMENTARY

ALGEBRA

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VECTOR CALCULUS
  Eulerian(n, k)
Returns the number of permutations of {1,2,..n} having k permutation ascents.

The parameters n, k should both be positive integers > 0 with k <= n.


Examples  









References
http://mathworld.wolfram.com/EulerianNumber.html
http://en.wikipedia.org/wiki/Eulerian_number

Related Functions
Factorial, nCr, nPr, Binomial





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