There are 15 points in a plane out of which only 6 are in a straight line, then(a) How many different straight lines can be made?(b) How many triangles can be made?

There are 15 points in a plane. No three points are collinear except 5 points. How many different straight lines can be formed?

There are 15 points in a plane, no three of which are in a straight line except 4, all of which are in a straight line. The number of triangles that can be formed by using these 15 points is:

There are 15 points in a plane, no three of which are in a straight line except 4, all of which are in a straight line. The number of triangles that can be formed by using these 15 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 12 points in a plane, no three points are collinear except 6 points. How many different triangles can be formed?

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

There are 12 points in a plane in which 6 are collinear. Number of different straight lines that can be drawn by joining them, is

There are 12 points in a plane in which 6 are collinear. Number of different straight lines that can be drawn by joining them, is

There are 12 points in a plane in which 6 are collinear. Number of different straight lines that can be drawn by joining them, is