Question

25!
Which expression represents
(25– 12)!12!?
25012
o 23C13
25P 12

Answer 1

`25C_(12)`

Explanation:

We are given that an expression

`(25!)/((25-12)!12!)`

We have to find the expression which represents
`(25!)/((25-12)!12!)`.

We know that

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

`nC_r=(n!)/((n-r)!r!)`

By using the formula

By comparing we get

n=25,r=12

`(25!)/((25-12)!12!)`

`=25C_(12)`

Hence, option a is true.

`25C_(12)`