JEE Advance - Mathematics (1986 - No. 6)
If $$S$$ is the set of all real $$x$$ such that $${{2x - 1} \over {2{x^3} + 3{x^2} + x}}$$ is positive, then $$S$$ contains
$$\left( { - \infty ,\, - {\textstyle{3 \over 2}}} \right)$$
$$\left( { - {3 \over 2},\, - {1 \over 4}} \right)$$
$$\left( { - {1 \over 4},\,{1 \over 2}} \right)$$
$$\left( {{1 \over 2},\,3} \right)\,\,\,\,$$