A) 21
B) 25
C) 26
D) none of these
Correct Answer: D
Solution :
[d] \[{{(1+2x+3{{x}^{2}}+...)}^{-3/2}}={{[{{(1-x)}^{-2}}]}^{-3/2}}\] \[={{(1-x)}^{3}}=1-3x+3{{x}^{2}}-{{x}^{3}}\] Therefore, coefficient of \[{{x}^{5}}\]is 0.You need to login to perform this action.
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