The number of lines that can be formed from 12 points in a plane of which 6 points lie on a line is

The number of lines that can be formed from 12 points is a plane of which no three of them are collinear except 6 points lie on a a line is

Number of different striaght lines that cn be formed by joining 12 different points on a plane of which 4 are collinear is

Number of different striaght lines that cn be formed by joining 12 different points on a plane of which 4 are collinear is

How many different straight lines can be formed from 30 points in a plane? (no three points are collinear)

The number of triangles that can be formed by choosing the vefrom a set of 12 points,seven of which lie on the same straight line,are: