PERMUT

Returns the number of permutations[1][2] of n unlike things taken k at a time.

Syntax:

PERMUT( n:Number, k:Number )

This function yields the number of permutations of n unlike things taken k at a time.

Formula:

nPk = n! ∕ (nk)!

For very large n an approximation is achieved using logarithms.

Revisions:

This function was added in 1.30.

  1. Weisstein, Eric W. "Permutation." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Permutation.html
  2. "Permutations and Combinations." Chapter V, Section E, Online Statistics Education: A Multimedia Course of Study (http://onlinestatbook.com/). Project Leader: David M. Lane, Rice University.