$^n{C_r}{ + ^n}{C_{r - 1}}$ is equal to
$^n{C_r}{ + ^n}{C_{r - 1}}$ is equal to
- A
$^{n + 1}{C_r}$
- B
$^n{C_{r + 1}}$
- C
$^{n + 1}{C_{r + 1}}$
- D
$^{n - 1}{C_{r - 1}}$
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