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Subjects
Class 11MathematicsPermutations and CombinationsCombinationsMedium
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Among (12) points (4) points are collinear and no other (3) points are collinear. How many triangles can be formed?

Answer and explanation

Correct answer: (216)

Total triples are (\binom{12}{3}=220) and (\binom{4}{3}=4) triples from collinear points do not form triangles. Hence (220-4=216).

Related tags

CombinationsClass11MediumPermutations And CombinationsMathematicsClass 11 Mcq
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