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Subjects
Class 11MathematicsPermutations and CombinationsCombinationsMedium
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How many (4)-element subsets can be formed from (A={1,2,3,4,5,6,7,8,9}) that contain (1)?

Answer and explanation

Correct answer: (56)

The element (1) is already chosen so the remaining (3) elements are chosen from (8). The number of ways is (\binom{8}{3}=56).

Related tags

CombinationsClass11MediumPermutations And CombinationsMathematicsClass 11 Mcq
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