If overset(n)underset(r=0)Sigma (r )/("...

If `overset(n)underset(r=0)Sigma (r )/(""^(n)C_(r))=a` then the value of `overset(n)underset(r=0)Sigma (1)/(""^(n)C_(r))` is

A

`(2a)/(n)`

B

`(a)/(n)`

C

`(n)/(2a)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:

A

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