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 12 points in a plane, no three points are collinear except 6 points. How many different triangles can be formed?

Out of 18 points in a plane, no three are in the same line except 5 points which are collinear How many straight lines can be formed by joining the given points?

Twenty points are marked on a plane so that non three points are collinear except 7 points. How many triangle can be formed by joining the points?

There are 25 points in a plane. Six of these are collinear and no other combination of 3 points are collinear. How many different straight lines can be formed by joining these points?

Twelve points are marked on a plane so that no three points are collinear. How many different triangles can be formed joining the points.

Out of 18 points in a plane, no three are in the same line except 5 points which are collinear How many triangles can be formed by joining the given points.

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?

Seventeen points are marked on plane so that no three points are collinear. How many straight lines can be formed by joining these points?

A plane contains 12 points of which 4 are collinear. How many different stragith lines can be formed with these points?