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If a(n)=sum(r=0)^(n)(1)/(""^(n)C(r)) the...

If `a_(n)=sum_(r=0)^(n)(1)/(""^(n)C_(r))` then `sum_(r=0)^(n)(r)/(""^(n)C_(r))` equal to

A

`(1)/(2)n`

B

`(2n-1)/(2)`

C

`n-1`

D

`(1)/(2)n-1`

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-BINOMIAL THEOREM-EXERCISE 1B (BINOMIAL COEFFICIENTS)
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