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[" If "6,8" and "12" are "l^(" th "),m^(...

[" If "6,8" and "12" are "l^(" th "),m^(" th ")" and "n^(" th ")" terms of an A.P.and "f(x)=nx^(2)+2lx-2m],[f(x)=0" has - "],[[" (A) a root between "0" and "1," (B) both roots imaginary."],[" (C) both roots negative."," (D) both roots greater than "1]]

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