${ \color{#FF6800}{ 4 } }!$
$ $ คำนวณโดยใช้ $ n! = n\times\left(n-1\right)\times\cdots\times2\times1$
$\color{#FF6800}{ 4 } \color{#FF6800}{ \times } \color{#FF6800}{ 3 } \color{#FF6800}{ \times } \color{#FF6800}{ 2 } \color{#FF6800}{ \times } \color{#FF6800}{ 1 }$