Question

Type the formula for the number of permutations of n things taken r at a time.

Answer 1

`(n!)/(n-r!)` is the formula

Answer 2

Answer:
`(n!)/((n-r)!)`

Explanation:

• Permutation is a way of arranging the elements of a set into a order or a sequence . Here order matters.

The number of permutations of n things taken r at a time is given by the following formula:

`^nP_r=(n!)/((n-r)!)`

Therefore, the formula for the number of permutations of n things taken r at a time is
`(n!)/((n-r)!)`