Question

^{n}C_{r} + ^{2n}C_{r+1} + ^{n}C^{r+2} is equal to (2 r n)

- 2 .
^{n}C_{r+2}
^{n+1}C_{r+1}
^{n+2}C_{r+2}
- none of these

^{n}C_{r+2}^{n+1}C_{r+1}^{n+2}C_{r+2}## The correct answer is: ^{n+2}C_{r+2}

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