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Subjects
Class 11MathematicsPermutations and CombinationsCombinationsMedium
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How many (3)-element subsets can be formed from (A={1,2,3,4,5,6,7}) that contain (1)?

Answer and explanation

Correct answer: (15)

The element (1) is already chosen so the remaining (2) elements are chosen from (6). The number of ways is (\binom{6}{2}=15).

Related tags

CombinationsClass11MediumPermutations And CombinationsMathematicsClass 11 Mcq
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