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Class 11MathematicsPermutations and CombinationsCombinationsExpert
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A set of (12) elements has (4) special elements. How many (5)-element subsets contain at least (2) special elements?

Answer and explanation

Correct answer: (456)

Taking the number of special elements as (2,3,4) gives (456). With a small special group, directly add valid cases.

Related tags

Class11CombinationsAt-LeastSpecial-ElementsExpertPermutations And CombinationsMathematicsClass 11 Mcq
सुधार सुझाएँ / Earn

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