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In the expansion of (k + x)8 , the coefficient of x5 is 10 times the coefficient of x6. Find the value of k.

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Coefficient of x5 in (k + x)8 = 8C5 k8-5

 = 8C5 k3

Coefficient of x6 in (k + x)8 = 8C6 k2

The Coefficient of x5 is 10 times coefficient of x6.

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