Question

I need help please and thank you

Answer 1

15

Explanation:

n is the number of people and k the number of chairs

here n = 6 and k = 4

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

`(6!)/(4!(6  -4)!)`

=
`(6(5)(4)(3)(2)(1))/(4!(2!))`

=
`(720)/(4(3)(2)(1)2(1))`

=
`(720)/(24(2))`

=
`(720)/(48)`

= 15