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[" 11.If "S" is the set of all real "x" such that "(2x-1)/(2x^(3)+3x^(2)+x)" is "],[" positive,then "S" contains "],[[" (a) "(-oo,-(3)/(2))," (b) "(-(3)/(2),-(1)/(4))],[" (c) "(-(1)/(4),(1)/(2))," (d) "((1)/(2),3)]]

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