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If the line y = 4 + kx, k > 0, is the tangent to the parabola y = x – x 2 at the point P and V is the vertex of the parabola, then the slope of the line through P and V is :

1. 2 3
2. 9 26
3. 2 5
4. 6 23

Correct answer: 2 5

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