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JEE Advance - Mathematics (1983 - No. 39)
If $$y = a\,\,In\,x + b{x^2} + x$$ has its extreamum values at $$x=-1$$ and $$x=2$$, then
$$a = 2,b = - 1$$
$$a = 2,b = - {1 \over 2}$$
$$a = - 2,b = {1 \over 2}$$
none of these
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