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The set of values of p for which the poi...

The set of values of p for which the points of extremum of the function, `f(x) = x^3 -3px^2 + 3 (p^2 -1)x + 1` lin in the interval `(-2,4)` is

A

`(-1,0)`

B

`(-2,4)`

C

`(-1,5)`

D

`(-1,3)`

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The correct Answer is:
D
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