conic-section

Question: If ${{y}_{1}},\ {{y}_{2}}$ are the ordinates of two points P and Q on the parabola and ${{y}_{3}}$ is the ordinate of the point of intersection of tangents at P and Q, then



1) ${{y}_{1}},\ {{y}_{2}},\ {{y}_{3}}$ are in A.P.
2) ${{y}_{1}},\ {{y}_{3}},\ {{y}_{2}}$ are in A.P.
3) ${{y}_{1}},\ {{y}_{2}},\ {{y}_{3}}$ are in G.P.
4) ${{y}_{1}},\ {{y}_{3}},\ {{y}_{2}}$ are in G.P.
Solution: Explanation: No Explanation
Parabola

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