None. In ordinary geometry, a line contains an infinite number of points and, by definition, they are all collinear.
In projective geometry, however, you can have three lines in the form of a triangle. Each line has only two points on it, so it cannot have 3 points collinear.
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only 1 lines can contain 3 collinear points. Maybe you mean coplanar?
Two intersecting lines can always cover three non-collinear points.
7.
There are 91 lines.
only one line