If (2 le r le n). then ""^(n)C(r) + 2. "...

If `(2 le r le n)`. then `""^(n)C_(r) + 2. ""^(n)C_(r+2)` is equal to

A

`2 ""^(n)C_(r+2)`

B

`""^(n+1)C_(r+1)`

C

`""^(n+2)C_(r+2)`

D

`""^(n+1)C_(r)`

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