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Question

Find the coefficient of x11 in the expansion (16x6)(1x)7


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 D

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Coefficient of x11 in (xx6)6(1x)7

Ignoring the higher order terms

Coefficient of x11 in (16x6)(1x)7

Coefficient of x11 in (16x6)(1+7C1x+8C2x2+9C3x3+..............) = 17C11611C6=17C6611C5


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