1.

The locus of the orthocentre of the triangle formed by the lines (1 p)x – py p(1 p) = 0, (1 q)x – qy q(1 q) = 0 and y = 0, where p ≠ q, is

A. a hyperbola
B. a parabola
C. an ellipse
D. a straight line
Answer» E.


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