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The function y=alogx+b x^2+x has extreme...

The function `y=alogx+b x^2+x` has extreme values at `x=1` and `x=2` . Find `a` and `b` .

A

`(1,1/2)`

B

`(1/2,2)`

C

`(2,(-1)/2)`

D

`((-2)/3,(-1)/6)`

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The correct Answer is:
D
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