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If {:("n-r"),( sum),("k=1"):} .^(n-k)C(...

If `{:("n-r"),( sum),("k=1"):} .^(n-k)C_(r)=.^(x)C_(y)`then

A

`x=n+1,y=r`

B

`x=n,y=r+1`

C

`x=n,y=r`

D

`x=n+1,y=r+1`

Text Solution

Verified by Experts

The correct Answer is:
B
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