NDA 2019 Mathematics question

There are 10 points in a plane. No three of these points are in a straight line. What is the total number of straight lines which can be formed by joining the points?

(A)90
(B)45Correct
(C)40
(D)30

Answer: (B)

Solution

Since no three points are collinear, every pair of points gives a different line.

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Question ID VK-035358