A) \[\frac{\left( r+1 \right)\left( r+2 \right)\left( r+3 \right)}{6}{{x}^{r}}\]
B) \[\frac{\left( r+2 \right)\left( r+3 \right)}{2}{{x}^{r}}\]
C) \[\frac{{{x}^{r}}}{r!}\]
D) None of these
Correct Answer: B
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