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Let the function f ( x ) = 2 x 3 + (2 p – 7) x 2 + 3(2 p – 9) x – 6 have a maxima for some value of x < 0 and a minima for some value of x > 0. Then, the set of all values of p is

1.       2 9 , 0
2.        , 2 9
3.        2 9 , 2 9
4.         2 9 ,

Correct answer:         2 9 ,

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