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Let lambda,mu be such that the equations...

Let `lambda,mu` be such that the equations `4x^2 - 8x + 3 = 0, x^2 + lambdax - 1 = 0 and 2x^2 + x + mu = 0` may have a common root for each pair of equations but all 3 equations do not have a common root, then `mu xx lambda` equals

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