If y(1),y(2) are the ordinates of two po...

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 intersection of tangents at P and Q, then

`y_(1), y_(2),y_(3)` are in A.P

`y_(1),y_(3),y_(3)` are in A.P.

`y_(1),y_(2),y_(3)` are in G.P

`y_(1),y_(3),y_(2)` are in G.P

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