Answer:
3! = 3 * 2 * 1 = 6
Explanation:
3! is said as "three factorial". Factorials start at the given number and then are multiplied by the following decrementing numbers.
So, 5! = 5 * 4 * 3 * 2 * 1 and 12! = 12 * 11 * 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1.