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Class 11MathematicsPermutations and CombinationsCombinationsExpert
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Among (10) distinct points, (4) points are collinear. How many straight lines are determined?

Answer and explanation

Correct answer: (40)

Total pairs are (^{10}C_{2}=45). The (^{4}C_{2}=6) pairs among collinear points give only (1) line, so (45-6+1=40).

Related tags

GeometryLinesCollinearCombinationsPermutations And CombinationsMathematicsClass 11 Mcq
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