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satellite73Best ResponseYou've already chosen the best response.1
\[7\times 6\times 5\]
 one year ago

myininayaBest ResponseYou've already chosen the best response.2
\[n P r=\frac{n!}{(nr)!}\]
 one year ago

myininayaBest ResponseYou've already chosen the best response.2
\[7 P 3=\frac{7!}{(73)!}=\frac{7!}{4!}=\frac{7 \cdot 6 \cdot 5 \cdot 4!}{4!}=7 \cdot 6 \cdot 5 \]
 one year ago
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