Question

Does anyone know how to solve this problem? What it means? And Answer? thanks!!

........
Evaluate.

5!4! =

Answer 1

`5!4!=1\cdot2\cdot3\cdot2\cdot4\cdot5\cdot1\cdot2\cdot3\cdot4=2880`

Answer 2

It wants you to multiply the positive integers that come before it.

5! = 5 * 4 * 3 * 2 * 1
4! = 4 * 3 * 2 * 1

5!4! = 5 * 4 * 3 * 2 * 1 * 4 * 3 * 2 * 1 = 2880