A) 260
B) 220
C) 105
D) none of these
Correct Answer: D
Solution :
\[{{T}_{r+1}}{{=}^{n}}{{C}_{r}}{{x}^{n-r}}{{y}^{r}}\] \[{{=}^{12}}{{C}_{r}}{{x}^{12-r}}{{y}^{-4r}}\] \[{{=}^{12}}{{C}_{r}}{{x}^{12-5}}^{r}\] Now,\[12-5r=0\Rightarrow r=\frac{12}{5}\] Which is not possible.You need to login to perform this action.
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