A) \[-5\]
B) \[5\]
C) \[4\]
D) \[-3\]
Correct Answer: B
Solution :
\[{{(1+x)}^{-2}}=1-2x+3{{x}^{2}}-4{{x}^{3}}+5{{x}^{4}}\] \[-....{{(-1)}^{r}}\,(r+1)\,{{x}^{r}}+....\] Clearly, coefficient of \[{{x}^{4}}\] is 5.You need to login to perform this action.
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