Question

I need help please and thanks

Answer 1

10

Explanation:

n is the number of selections and k the number selected, that is

n = 5 and k = 2

note that n! = n(n - 1)(n - 2) ..... × 3 × 2 × 1, thus

`(5(4)(3)(2)(1))/(2!(5-2)!)`

=
`(120)/(2(1)3(2)(1))`

=
`(120)/(2(6))`

=
`(120)/(12)`

= 10