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Axis of a parabola lies along x-axis. If its vertex and focus are at distances 2 and 4 respectively from the origin, on the positive x-axis then which of the following points does not lie on it ?

1. (8, 6)
2. (4, –4)
3. (6, 2 4 )
4. (5, 6 2 )

Correct answer: (8, 6)

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