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How many straight lines can be formed from (12) points if no (3) points lie on the same line?

Answer and explanation

Correct answer: 66

A straight line is determined by a pair of distinct points. Since no three points are collinear, every pair of points gives a different line. Therefore, the number of lines is \(\binom{12}{2}=\frac{12\times11}{2}=66\). The value \(132\) would count each pair in two orders. Exam tip: when no three of \(n\) points are collinear, use \(\binom{n}{2}\) to find the number of lines.

Related tags

CombinationsPermutations And CombinationsLines From PointsClass 11 MathematicsBinomial CoefficientMathematicsClass 11 Mcq

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