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Let x(1),x(2) be the roots of x^(2)-3x+a...

Let `x_(1),x_(2)` be the roots of `x^(2)-3x+a=0andx_(3),x_(4)` be the roots of `x^(2)-12x+b=0` . If `x_(1)ltx_(2)ltx_(3)ltx_(4)andx_(1),x_(2),x_(3),x_(4)` are in GP then ab equals

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