There are 12 points in a plane, out of which 3 points are collinear. How many straight lines can be drawn by joining any two of them?

There are 18 points in a plane of which 5 are collinear. How many straight lines can be formed by joining them?

Sixty points lie on a plane, out of which no three points are collinear. How many straight lines can be formed by joining pairs of points ?

There are n points in a plane of which p points are collinear. How many lines can be formed from these points?

There are 10 points in a plane out of which 5 are collinear. The number of straight lines than can be drawn by joining these points will be

Out of 8 given points, 3 are collinear. How many different straight lines can be drawn by joining any two points from those 8 points?

There are n points in a plane of which 'p' points are collinear.How many lines can be formed from these points

There are n points in a plane of which 'p' points are collinear. How many lines can be formed from these points