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For the given values of $n$ and $r_{1}$ evaluate (a) $(n?r)!n!?$ and $(b)r!(n?r)!n!?$ for $n=10$ and $r=4$. (a) When $n=10$ and $r=4,(n?r)!n!?=$ (Simplify your answer. Type an integer or a simplified fraction.) (b) When $n=10$ and $r=4,r(n?r)!n!?=$ (Simplify your answer. Type an integer or a simplified fraction.)

(a) n=10 and r = 4n!(n?r)!=10!(10?4)!=10×9×8×7×6

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