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The curve y=ax^3 + bx^2 + cx + d has a p...

The curve `y=ax^3 + bx^2 + cx + d` has a point of inflexion at x=1 , then :

A

`a+b=0`

B

`a+3b=0`

C

`3a+b=0`

D

`3a+b=1`

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PREMIERS PUBLISHERS-MODEL QUESTION PAPER -1-Part -IV
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