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If the functions f(x) = 2 ax bx 2 3 x 2 3   and g(x) b 2 a , bx ax 3 x 2 3    have a common extreme point, then a + 2b + 7 is equal to

1. 3
2. 4
3. 6
4. 2 3

Correct answer: 6

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