## FANDOM

In maths, ! represents the factorial of a number. The factorial applies to all natural numbers, except zero. To calculate the factorial of a number, multiply the number chosen by the number that is one lesser than it, and then multiply the result by the number 2 times lesser than the original number, etc. like this:

$7! = 7 * 6 * 5 * 4 * 3 * 2 * 1$

Thus, 7! would be 5040.

## Exercise

Work out the following:

1. 2!
2. 5!
3. 10!