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What is the number of ways to arrange 5 objects from a set of 9 different objects
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What is the number of ways to arrange 5 objects from a set of 9 different objects

User Kvam
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\bf _nP_r=\cfrac{n!}{(n-r)!}\qquad \begin{cases} n=9\\ r=5 \end{cases}\implies _9P_5=\cfrac{9!}{(9-5)!}
User LDomagala
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