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

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

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?

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 20 points in a plane, of which 5 points are collinear and no other combination of 3 points are collinear. How many different triangles can be formed by joining these points?

There are ten points in the plane, no three of which are coolinear. How many different lines can be drawn through these points ?

There are ten points in the plane, no three of which are coolinear. How many different lines can be drawn through these points ?

There are ten points in the plane, no three of which are coolinear. How many different lines can be drawn through these 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?