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