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IF n and r are positive inegers such ...

IF n and r are positive inegers such that r `le n ` then ` ""^(n) C_(r) + ""^(n)C_(r-1)`=

A

`""^(2n)C _(2r-1)`

B

`""^((n+1))C_r`

C

`""^(n)C _(r+1)`

D

`""^((n+1))C _(r+1)`

Text Solution

Verified by Experts

The correct Answer is:
B
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