$\sum\limits_{r = 0}^m {^{n + r}{C_n} = } $
$\sum\limits_{r = 0}^m {^{n + r}{C_n} = } $
- A
$^{n + m + 1}{C_{n + 1}}$
- B
$^{n + m + 2}{C_n}$
- C
$^{n + m + 3}{C_{n - 1}}$
- D
None of these
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