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Let the focal chord PQ of the parabola y 2 = 4x make an angle of 60° with the positive x-axis, where P lies in the first quadrant. If the circle, whose one diameter is PS, S being the focus of the parabola, touches the y-axis at the point (0, α ), then 5 α 2 is equal to :

1. 15
2. 25
3. 30
4. 20

Correct answer: 15

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