The coefficient in x in the second term of the expansion of x2 - 1-4 nis equal to 31- Find the power n-

Given coefficient of second term is #160; ^nC_1(14)=31 n=124 ...

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Question

The coefficient in $x$ in the second term of the expansion of ${(x^{2} - \frac{1}{4})}^{n}$ is equal to $31$ . Find the power $n$ .

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