As long as at least two of them are different points, exactly one line.
Three
only 1 lines can contain 3 collinear points. Maybe you mean coplanar?
7.
No. Collinear means on the same line. So collinear points all must lie on the same line. Not parallel lines.
3
As long as at least two of them are different points, exactly one line.
3
There are 13*12/2 = 78 lines.
# 1
15 lines.
Not sure about complanar. Coplanar lines can be collinear but need not be.
Three
depends on the position of the points if points are collinear, we have just only one line, the minimum number. If points are in different position (if any of the two points are not collinear) we have 21 lines (7C2), the maximum number of lines.
only 1 lines can contain 3 collinear points. Maybe you mean coplanar?
The definition of a non-collinear line is that this is a line on which points do not lie on one line. The opposite of this is a collinear point. Collinear points refer to three points that do fall on a straight line.
7.