Evaluate the expression. 9! - 5!

The! sign in mathematics means factorial.

This is the product of a number and below it until 1.

In mathematical language

a! = a * (a - 1) !

So,

5! = 5 * 4 * 3 * 2 * 1 = 120

9! = 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 = 326 880

Therefore 9! - 5! = 326 880 - 120 = 326 760