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In nC5=56,the value of n is

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In nC5=56,the value of n is ​

 

Answer:

n = 8

Step-by-step explanation:

C(n,r)=\frac{n!}{(n-r)!r!}

C(n,5)=\frac{n!}{(n-5)!5!}=56

n(n-1)(n-2)(n-3)(n-4)=56(5!)

n(n-1)(n-2)(n-3)(n-4)=6720

n=8


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