The coefficient of \[{{x}^{-9}}\] in the expansion of \[{{\left( \frac{{{x}^{2}}}{2}-\frac{2}{x} \right)}^{9}}\] is [Kerala (Engg.) 2001]

The coefficient of \[{{x}^{-9}}\] in the expansion of \[{{\left( \frac

1.	The coefficient of \[{{x}^{-9}}\] in the expansion of \[{{\left( \frac{{{x}^{2}}}{2}-\frac{2}{x} \right)}^{9}}\] is [Kerala (Engg.) 2001]
A.	512
B.	-512
C.	521
D.	251
Answer» C. 521

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The coefficient of \[{{x}^{-9}}\] in the expansion of \[{{\left( \frac{{{x}^{2}}}{2}-\frac{2}{x} \right)}^{9}}\] is [Kerala (Engg.) 2001]

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