Factorial

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Write a function to return the factorial of a number.

Factorial of a number is given by:

n! = n * (n-1) * (n-2) * ..... * 1

For example:

  • 3! = 3 * 2 * 1 = 6
  • 4! = 4 * 3 * 2 * 1 = 24

Note: 0! = 1

Test

{{test}}

Console output