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[" 51.If the equations "x^(2)-ax+b=0" an...

[" 51.If the equations "x^(2)-ax+b=0" and "],[x^(2)+bx-a=0" have a common root,then "],[[" (a) "a+b=1," (b) "a=b],[" (c) "a+2b=1," (d) "a-b=1]]

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