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sum(r=0)^(n-1) (""^(n)C(r))/(""^(n)C(r) ...

`sum_(r=0)^(n-1) (""^(n)C_(r))/(""^(n)C_(r) + ""^(n)C_(r+1))` is equal to

A

`(n)/(2)`

B

`(n+1)/(2)`

C

`(n(n+1))/(2)`

D

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

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The correct Answer is:
A
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AAKASH INSTITUTE ENGLISH-BINOMIAL THEOREM-Assignment (section-B)
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  7. If (1 + x)^(n) = sum(r=0)^(n) C(r) x^(r),(1 + (C(1))/(C(0))) (1 + (C(...

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  20. If n is ann integer greater than 1, then a-^(n)C(1)(a-1)+.^(n)C(2)(a...

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