Question

How do you evaluate `""_7P_7`?

Answer 1

5040

Explanation:

The permutation general formula is

`P_(n,k)=(n!)/((n-k)!)`; `n="population", k="picks"`

and so:

`P_(7,7)=(7!)/((7-7)!)=(7!)/(0!)=(7!)/1=5040`