Out of thirty points in a plane, eight of them are collinear. The number of straight lines that can be formed by joining these points, is
Explanation for correct option
Calculating the number of straight lines formed by joining the points:
Given, there are points in a plane, out of which points are collinear.
Number of ways in which points are chosen out of 30 points to form a line
Number of ways in which a line is formed by points in the collinear points
The required number of straight lines formed is:
( is for the line formed by collinear points)
Hence, the correct answer is Option(C).