4*3/2 = 6 lines.
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only 1 lines can contain 3 collinear points. Maybe you mean coplanar?
Three lines are determined by three points unless the points are all on the same line ( i.e. co-linear)
depend how many points are them
3 non-coplanar (pairwise) lines for 3 dimensional space.
As long as at least two of them are different points, exactly one line.