Answer
$720$
Work Step by Step
The expression $
6\cdot5\cdot4\cdot3\cdot2\cdot1
$ evaluates to
\begin{array}{l}
30\cdot4\cdot3\cdot2\cdot1
\\=
120\cdot3\cdot2\cdot1
\\=
360\cdot2\cdot1
\\=
720\cdot1
\\=
720
.\end{array}
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