Question

The number of permutations of n elements taken r at a time is given by the formula ________.

Answer 1

Answer:

$P(n,r) = \dfrac{n!}{(n-r)!}$

Step-by-step explanation:

We have to fill the blank.

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

$P(n,r) =^nP_r = \dfrac{n!}{(n-r)!}$

Permutation is an arrangement of subsets of a larger set in regard with order of the arrangement.

where n is the the larger set and we have to choose r items from n such that there is no repetition.

In permutation, order is important.