Q .     If the function `f(x) = x^3 - 6x^2 +ax+ b` satisfies Rolle's
theorem in the interval `[1, 3]` and `f' ((2sqrt3+1)/sqrt3) = 0`
then

BITSAT 2016
A

`a =11`

B

`a = -11`

C

`a = 6`

D

`a = - 6`

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