Question

How do you multiply Factorials?

Answer 1

Factorial :

Factorial is also known as permutation. the factorial of positive integer is $"n!"$. It is a continue multiplication starting from $1ton$

Formula of factorial $\mathit{n}\mathbf{!}\mathbf{=}\mathit{n}\mathbf{(}\mathit{n}\mathbf{-}\mathbf{1}\mathbf{)}\mathbf{(}\mathit{n}\mathbf{-}\mathbf{2}\mathbf{)}\mathbf{(}\mathit{n}\mathbf{-}\mathbf{3}\mathbf{)}\mathbf{.}\mathbf{.}\mathbf{.}\mathbf{.}\mathbf{.}\mathbf{4}\mathbf{\times }\mathbf{3}\mathbf{\times }\mathbf{2}\mathbf{\times }\mathbf{1}$

For example, find the factorial of $4!$

$$\begin{gathered} 4!=4\times 3\times 2\times 1 \\ =24 \end{gathered}$$

Hence, we can find factorial by using the above formula.