A) 8
B) 32
C) 50
D) None of these
Correct Answer: C
Solution :
\[={{(1+3x)}^{2}}{{(1-2x)}^{-1}}\] \[={{(1+3x)}^{2}}\left( 1+2x+\frac{1.2}{2.1}{{(-2x)}^{2}}+.... \right)\] \[=(1+6x+9{{x}^{2}})(1+2x+4{{x}^{2}}+8{{x}^{3}}+....)\] Therefore coefficient of \[{{x}^{3}}\] is\[(8+24+18)=50\].You need to login to perform this action.
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