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There are (9) points, no (3) of which are collinear. How many circles can be formed?

Answer and explanation

Correct answer: 84

A unique circle is determined by three non-collinear points. Since no three of the given points are collinear, every selection of 3 points from 9 gives one circle. Thus, the number of circles is \(\binom{9}{3}=\frac{9\times8\times7}{3\times2\times1}=84\). Option 126 equals \(\binom{9}{4}\), so it does not apply here. Exam tip: for circles, choose 3 non-collinear points.

Related tags

CombinationsPermutations And CombinationsCirclesNon-Collinear PointsClass 11 MathematicsMathematicsClass 11 Mcq

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