Answer
720
Work Step by Step
The number of possible permutations if r items are taken from n items is
nPr = $\frac{n!}{(n-r)!}$
6P6= $\frac{6!}{(6-6)!}$ = $\frac{6!}{0!}$ = $\frac{720}{1}$ = 720
We put 1 on the bottom since 0! = 1.
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