Question

C5.2 .C4.3
Me ajudem

Answer 1

Cn,p = n!/[p!(n-p)!]

$C5,2 *C4,3=\frac{5!}{2!(5-2)!} * \frac{4!}{3!(4-3)!} = \frac{5!}{2!3!} * \frac{4!}{3!1!} = \frac{5.4.3.2.1}{2.1.3.2.1}* \frac{4.3.2.1}{3.2.1.1} = \frac{2880}{72} \\ \\ =40$