There are 10 points in a plane, no three of which are in the same straight line, excepting 4 points, which are collinear. Find the the number of straight lines obtained from the pairs of these points.
There are 10 points in a plane, no three of which are in the same straight line, excepting 4 points, which are collinear. Find the the number of straight lines obtained from the pairs of these points.
Answers (1)
Solution:
As it is given 4 points are collinear out of 10 points.
The number of straight lines obtained from the 10 points =