Question

What is $0$ factorial?

Answer 1

Factorial of a number:

A number's factorial is the function that multiplies it by every natural integer below it.

The factorial of a number $n$ is computed as;

$n!=n\times (n-1)\times (n-2)\times (n-3)\times .....\times 3\times 2\times 1$

The value of $0!=1$

Hence, the value of $0!$ is equal to $1$.