Easy
$\binom{n}{r+1} + 2\binom{n}{r} + \binom{n}{r-1} = \dots$
- A$\binom{n+2}{r}$
- B$\binom{n+2}{r+1}$
- C$\binom{n+1}{r}$
- D$\binom{n+1}{r+1}$
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