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?

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Correct answer: B. 45

A straight line can be formed by joining 2 points. Total number of straight lines = ¹⁰ C ₂= 10 9 2 1 =45

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?

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