# 1
3 non-collinear points define one plane.
One! That is what collinear means!
10 collinear points form one set of overlapping line segments, of which there are 45.
Only one if they are non-collinear. An infinite number if they are collinear.
Three
3
3
There are 13*12/2 = 78 lines.
Any three non-collinear points will define a single plane. A plane is composed of an infinite number of distinct lines.
As long as at least two of them are different points, exactly one line.
7.
only 1 lines can contain 3 collinear points. Maybe you mean coplanar?
10!
There are 91 lines.
5 its 4
Two intersecting lines can always cover three non-collinear points.
3