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  • Evaluate n!/(n-r)!, when n=9,r=5

Q.5.     Evaluate \frac{n!}{(n-r)!}, when

            (ii)\; n=9,r=5

Answers (1)

best_answer

To evaluate \frac{n!}{(n-r)!},

Put  n=9,r=5

\frac{n!}{(n-r)!}=\frac{9!}{(9-5)!}

                   =\frac{9!}{4!}

                   =\frac{9\times 8\times 7\times 6\times 5\times 4!}{4!}

                   =9\times 8\times 7\times 6\times 5=15120

Posted by

seema garhwal

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