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[" If "a+b+c=0," then the quadratic equation "3ax^(2)+2bx+c=0],[" has "quad (1983-1" Mark ")],[" (a) at least one root in "[0,1]],[" (b) one root in "[2,3]" and the other in "[-2,-1]],[" (c) imaginary roots "],[" (d) none of these "]

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