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Equation of a common tangent to the circle x 2 + y 2 – 6x = 0 and the parabola, y 2 = 4x, is :

1. y 3 = x + 3
2. y 3 = 3x + 1
3. 2 y 3 = –x – 12
4. y 3 2 = 12x + 1

Correct answer: y 3 = x + 3

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