Here are some: They can be (1) coincident, (2) intersecting at one point, (3) coplanar but non-intersecting (ie parallel), (4) non-coplanar, non-parallel and non-intersecting (eg paths of a rail line and of an elevated road going over it - from above, they may appear to intersect but they do not), (5) intersecting at two points (eg longitudes on the earth). etc.
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Select two parallel lines out of 5: 5*4*3/(2*1) = 30 ways Select two parallel lines out of 4: 4*3*2/(2*1) = 12 ways Combine the above 2: 30*12 = 360 parallelograms.
3*2*1 = 6 ways.3*2*1 = 6 ways.3*2*1 = 6 ways.3*2*1 = 6 ways.
There is an infinite number of lines.
There are 11!/(3!*3!*2!*2!) = 277200 ways.
Neither. It has just 1.