Question

Choose the correct formula for combination.
A . n!/r!(n-r)!
B. n!/(n-r)!

Answer 1

The answer is A. n!/r(n-r)!

Answer 2

A.
`(n!)/((n-r!)r!)`

Explanation:

The formula for combinations is:
`(n!)/((n-r!)r!)`.

The formula for permutations is:
`(n!)/((n-r!))`

So, the correct answer is A.