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If f(x)=a ln |x|+bx^2+x has its extremum...

If `f(x)=a ln |x|+bx^2+x` has its extremum values at `x=−1 and x=2`, then `(A) `a=2,b=-1` (B) `a=2,b=-1/2` (C) `a=-2,b=1/2` (D) none of these

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