MathematicsHard64×since 2002Q2906If the coefficient of x7{x^7}x7 in [ax2+(1bx)]11{\left[ {a{x^2} + \left( {{1 \over {bx}}} \right)} \right]^{11}}[ax2+(bx1)]11 equals the coefficient of x−7{x^{ - 7}}x−7 in [ax−(1bx2)]11{\left[ {ax - \left( {{1 \over {b{x^2}}}} \right)} \right]^{11}}[ax−(bx21)]11, then aaa and bbb satisfy the relationAa−b=1a - b = 1a−b=1Ba+b=1a + b = 1a+b=1Cab=1{a \over b} = 1ba=1Dab=1ab = 1ab=1Check answerSkip