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This question uses combination.

So formula is (8!)/(8-5)!5!


40320/720 = 56

You have 56 combinations of how to dress the mannequin
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Nope. You're wrong. That's PERMUTATION. The solution must be 8!/3! = 6720 ways
 P\frac{8!}{(8-5)!} =  \frac{8!}{3!} = 6720

She can dress them up in 6,720 ways
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