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Question

The coefficient of x4 in the expansion of (x23x2)10 is


A

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B

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C

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D

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Solution

The correct option is C


r=10×141+2=1043=62=2The coefficient x4 is 10C2(12)102(3)2=10×92.128.32=10×812×28=5×81256=405256


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