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xP2=42(x−n)!=120xCn+3= ? \begin{aligned} ^{ x }{ { P } }_{ 2 } & =& 42 \\ (x-n)! & =& 120 \\ ^{ x }{ { C } }_{ n+3 } & =& \ ? \end{aligned} xP2(x−n)!xCn+3===42120 ?
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