There are n points in a plane, no 3 of which are collinear and p points are collinear. The number of straight lines by joining them:

There are 10 points in a plane, out of which 5 are collinear. Find the number of straight lines formed by joining them.

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

There are 16 points in a plane of which 6 points are collinear and no other 3 points are collinear.Then the number of quadrilaterals that can be formed by joining these points is

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 10 points in a plane, out of which 6 are collinear. If N is the number of triangles formed by joining these points, then :