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None. Parallel lines do not intersect in Euclidean geometry.
Two lines can intersect at none, one or infinitely many points.
A point can be intersected by infinitely many lines. Two points intersect in only one line. Three points either intersect in a line or not at all. This is only considering two dimensions.
None. A marble is a sphere, so there are no points where lines intersect.
If no pair of lines is parallel and if each pairwise intersection is distinct, there will be 10 points of intersection.