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

If `(2lerlen)`, then `""^(n)C_(r)+2.""^(n)C_(r+1)+""^(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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A, B, C
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