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

There are 8 points, in a plane, how many different triangles can be formed using these points (no three points are collinear)?

The number of straight lines that can be formed by n points in a plane, where no three points are collinear is _____ and in case p of the given points are collinear is _____ .

There are 20 points in a plane. How different triangles can be formed with these points? (no three points are collinear).

How many straight lines can be formed from 8 non-collinear points on the X-Y plane?

The number of triangles that can be formed by n points in a plane where no three points are collinear is ______ and when p of the given points are collinear is ____ .

There are n points in a plane. Find the number of straight lines that can be obtained by joining points if a) no three points are collinear. b) p points are collinear.

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