The number of straight lines that can be formed by joning 20 points of which 4 are collinear is-

The number of straight lines that can be formed by joining 20 points of which 4 points are collinear is:

The number of straight lines that can be formed by joining 20 points of which 4 points are collinear is

The number of straight lines that can be formed by joining 20 points no three of which are in the same straight lines except 4 of them which are in the same line

The number of straight lines that can be drawn out of 10 points of which 7 are collinear is :

How many Straight line can be formed by joining 12 points, 4 of which are collinear.

Out of thirty points in a plane , eight of them are collinear . The number of strainght lines that can be formed by joining these points 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.

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