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For all a ,b I R the functio f(x)=3x^(4)...

For all a ,b I R the functio `f(x)=3x^(4)-4x^(3)+6x^(2)+ax+b` has

A

no extremum

B

exactly one extremum

C

exactly two extremum

D

three extremum

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Verified by Experts

The correct Answer is:
B
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