Answer
$6!=720$
Work Step by Step
Using $n!=n(n-1)(n-2)...(3)(2)(1),$ the value of the given expression, $
6!
,$ is
\begin{align*}\require{cancel}
&
6(5)(4)(3)(2)(1)
\\&=
720
.\end{align*}
Hence, $
6!=720
$.
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