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

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?

There are 10 points in a plane, out of which 5 are collinear. Find the number of straight lines formed by joining them.

There are n points in a plane of which p points are collinear. How many lines can be formed from these points?

There are n points in a plane of which m points are collinear. How many lines can be formed from these points ?

There are 12 points in a plane of which 5 are collinear . Find the number of straight lines obtained by joining these points in pairs .

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