Question

How do you evaluate 9 P 7?

Answer 1

`181,440`

Explanation:

I write permutations this way:

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

and so 9 P 7 `=`

`P_(9,7)=(9!)/(2!)=9xx8xx7xx6xx5xx4xx3=181,440`