The factorial of a non-negative integer [math]n[/math] is the product of all positive integers less than or equal to [math]n[/math].
The factorial function is defined by the product
[math]{\displaystyle {\begin{aligned}n!&=\prod _{k=1}^{n}k\\&=1\cdot 2\cdot 3\cdots (n-2)\cdot (n-1)\cdot n\\&=n(n-1)(n-2)\cdots (2)(1)\\\end{aligned}}}[/math]
It is inaccurate to ...
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