A) 7
B) 8
C) 9
D) 10
Correct Answer: C
Solution :
\[{{T}_{r}}={{\,}^{15}}{{C}_{r-1}}{{({{x}^{4}})}^{16-r}}{{\left( \frac{1}{{{x}^{3}}} \right)}^{r-1}}={{\,}^{15}}{{C}_{r-1}}{{x}^{67-7r}}\] Þ \[67-7r=4\Rightarrow r=9\].You need to login to perform this action.
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