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There are (10) points, no (3) of which are collinear. How many circles will be determined?

Answer and explanation

Correct answer: 120

Any three non-collinear points determine one unique circle. Since no three of the given points are collinear, any set of 3 points can be chosen. Therefore, the number of circles is \(\binom{10}{3}=\frac{10\times9\times8}{3\times2\times1}=120\). The value 90 does not represent the required unordered selection; the order of chosen points is irrelevant here. Exam tip: Use combinations \(\binom{n}{r}\) when the order of selection does not matter.

Related tags

CombinationsCirclesNon-Collinear PointsClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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