Question

DOES ANYBODY KNOW HOW TO DO THIS CUZ IM LOST!!!!

Evaluate.
5!4! = ?

Answer 1

dat be a factorial
5!=5*4*3*2*1
4!=4*3*2*1
so 5!4!=5*4*3*2*1*4*3*2*1=
5*16*9*4*1=
80*36=2880