X3

Anp

anp calculates the number of permutations (for example, ordered arrangements) of p objects taken from n.

Syntax

   anp(N,P)

* `N` and `P` are integer expressions. `P` must be in the [0,N] range.

   Local Integer I,J, NB_PERM
   I=10
   J=8
   NB_PERM=anp(I,J) : # Returns 1814400

anp(N,P) returns fac(N)/ fac(N-P).

To avoid loosing precision, the calculation algorithm does not use the factorial function. If N and P are not integer values, they are truncated.

The type of result is Integer or Decimal depending if the value is smaller or greater than 2^31-1.