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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!

The answers are here: Factorial of a number/answers