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Subjects
Class 11MathematicsPermutations and CombinationsCombinationsMedium
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Among (13) points (5) points are collinear and no other (3) points are collinear. How many triangles can be formed?

Answer and explanation

Correct answer: (276)

Total triples are (\binom{13}{3}=286) and (\binom{5}{3}=10) collinear triples do not form triangles. Hence (286-10=276).

Related tags

CombinationsClass11MediumPermutations And CombinationsMathematicsClass 11 Mcq
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