Seventeen points are marked on plane so that no three points are collinear. How many 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.

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?

Sixty points lie on a plane, out of which no three points are collinear. How many straight lines can be formed by joining pairs of points ?

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

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?

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?

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?

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

out of 18 points in a plane no three are in the same straight lines except five points which are collinear how many straight lines can be formed by joining them?