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underset(r=0)overset(n-1)(sum)(.^(n)C(r)...

`underset(r=0)overset(n-1)(sum)(.^(n)C_(r))/(.^(n)C_(r)+.^(n)C_(r+1))` equals

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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