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""^(n)C(r-1)+3^(n)C(r)+3^(n)C(r+1)+^(n)C...

`""^(n)C_(r-1)+3^(n)C_(r)+3^(n)C_(r+1)+^(n)C_(r+2)` is equal to

A

a) `""^(n+2)C_(r+1)`

B

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

C

c) `""^(n+2)C_(r+3)`

D

d) `""^(n+3)C_(r+2)`

Text Solution

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The correct Answer is:
D
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