3 lines and one plane
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There are 13*12/2 = 78 lines.
This is true. If three straight lines are drawn, they can only intersect at two points. That is, each line will only intersect with another once.
As defined by Math Open Reference: collinear points are points that lie on the same line. Any series of points with a yvalue of 4, for example, will be collinear since they lie on the same line. Lines formed by collinear points can have any slope and be located anywhere on a co-ordinate plane. The Math Open Reference link shows a working visual example of collinear points.
The answer will depend on the relative positions of the points.