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Subjects
Class 11MathematicsPermutations and CombinationsPermutationsHard
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Arrangements of (7) letters are to be made from (10) distinct letters, and two specified letters must be included and adjacent. How many arrangements are possible?

Answer and explanation

Correct answer: (80640)

Treat the two specified letters as one block, choose (5) more letters from the remaining (8), and arrange (6) units. Include the (2!) internal orders of the block.

Related tags

PermutationsLettersAdjacentPermutations And CombinationsMathematicsClass 11 Mcq
सुधार सुझाएँ / Earn

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