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

            (i)\; n=6,r=2

           

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To evaluate \frac{n!}{(n-r)!},

Put  n=6,r=2

\frac{n!}{(n-r)!}=\frac{6!}{(6-2)!}

                   =\frac{6!}{4!}

                   =\frac{6\times 5\times 4!}{4!}

                   =6\times 5=30

 

 

 

Posted by

seema garhwal

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