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If P is the pole of chord AB of a parabo...

If `P` is the pole of chord AB of a parabola dnt he length of perpendiculars from A, P, B on any tangent to the curve be `p_1, p_2 and p_3`, then (A) `p_3` is the G.M. between `P_1 and p_2` (B) `p_3` is the A.M. between `p_1 and p_2` (C) `p_1` is the G.M. between `P_1 and p_3` (D) none of these

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