Question

How do you calculate 6!?

Answer 1

`6! = 6*5*4*3*2*1 = 720`

Explanation:

For any natural number `n`,
`n! = n(n-1)(n-2)...3*2*1`

Then, for `n=6` we have

`6! = 6*5*4*3*2*1 = 720`