A factorial, represented as
(where
is an integer), is equal to the product of itself and all integers less than it until you get to one. Represented mathematically, we could say:
![n! = n \cdot (n - 1) \cdot (n - 2) \cdot \, \ldots \,\cdot 1](https://img.qammunity.org/2019/formulas/mathematics/middle-school/wummhwjn7waktkp27zh8jzuypvlg6roq41.png)
When we use the formula, we can find 4!, as shown below:
![4! = 4 \cdot (4 - 1) \cdot (4 - 2) \cdot 1](https://img.qammunity.org/2019/formulas/mathematics/middle-school/aasx8b9xudps0vsx3ck486d9mu2misvf1f.png)
![4! = 4 \cdot 3 \cdot 2 \cdot 1](https://img.qammunity.org/2019/formulas/mathematics/middle-school/csrer30cuy4eiru4sskt2kgoxwllaf8ti4.png)
![\boxed{4! = 24}](https://img.qammunity.org/2019/formulas/mathematics/middle-school/h6regy2l2b8p618q3cahqxx10qhil9eaun.png)
4! is equal to 24, or the last answer choice.