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[" 7.If the roots of the equation "],[x^...

[" 7.If the roots of the equation "],[x^(3)-4x^(2)+mx-n=0" are in H.P.,then the "],[" mean root is "],[[" 1."(3n)/(m)," 2."(2n)/(m)," 3."(n)/(m)," 4."-(n)/(m)]]

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