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If the coefficient of x7 in the expansion of (ax2+1bx)11 and the coefficient of x−7 in the expansion of (ax−1bx2)11 are equal, then the value of (ab)2 is

Answer» If the coefficient of x7 in the expansion of (ax2+1bx)11 and the coefficient of x7 in the expansion of (ax1bx2)11 are equal, then the value of (ab)2 is


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