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The least possible value of a for which ...

The least possible value of a for which `(x^3-6x^2+11 x-6)/(x^3+x^2-10 x+8)+a/30=0`does not have a real solution is

A

-10

B

12

C

5

D

-30

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The least possible value of a for which (x^(3)-6x^(2)+11x-6)/(x^(3)+x^(2)-10x+8)+(a)/(30)=0 does not have a real solution is

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