Question

What is the factorial of a number?

Answer 1

Factorial of a number.

Factorial of a number '$n$' is the product of first $n$ natural number.

$n!$ represents the factorial of a number $n$.

such that $\mathit{n}\mathbf{!}\mathbf{=}\mathit{n}\left(n-1\right)\left(n-2\right)\mathbf{\dots }\mathbf{\dots }\left(3\right)\left(2\right)\left(1\right)$, where $n$ is a natural number

For example:

$\begin{array}{rcl}5!& =& 5\times 4\times 3\times 2\times 1\\ & \Rightarrow & 5!=20\end{array}$

Hence, the factorial of every number is the provided number multiplied by the previous number's factorial.