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In Euclidean geometry, only one.
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.
A set of 3 points will always be coplanar, but will only sometimes be collinear. Collinear points are always coplanar as well.
If the points are collinear, the number of possible planes is infinite. If the points are not collinear, the number of possible planes is ' 1 '.
only 1 lines can contain 3 collinear points. Maybe you mean coplanar?