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Subjects
Class 11MathematicsPermutations and CombinationsPermutationsHard
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When (6) letters are put into (6) addressed envelopes, how many ways have exactly (2) letters in wrong envelopes?

Answer and explanation

Correct answer: (15)

Choose the (2) wrong letters in (^{6}C_2) ways, and they must swap with each other. For exactly (2) wrong, those two letters interchange.

Related tags

PermutationsDerangementExactly WrongPermutations And CombinationsMathematicsClass 11 Mcq
सुधार सुझाएँ / Earn

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