. If P, Q, R are three points on a parabola y2 = 4ax whose
If P, Q, R are three points on a parabola y2 = 4ax whose ordinates are in geometrical progression, then the tangents at P and R meet on
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If P, Q, R are three points on a parabola y2 = 4ax whose ordinates are in geometrical progression, then the tangents at P and R meet on