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""^(n)C(r+1)+^(n)C(r-1)+2.""^(n)C(r)=...

`""^(n)C_(r+1)+^(n)C_(r-1)+2.""^(n)C_(r)=`

A

`((n+1),(r-1))`

B

`2((n+1),(r+1))`

C

`2((n+2),(r))`

D

`((n+2),(r))`

Text Solution

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The correct Answer is:
D
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