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(8) persons are to be seated around a circle. Two particular persons must sit together, but a third particular person must not sit next to either of them. How many arrangements are possible?

Answer and explanation

Correct answer: (960)

Treat the two adjacent persons as a block and subtract cases where the third person is adjacent to that block. In circular arrangements, fix one rotation.

Related tags

Circular-ArrangementBlock-MethodCountingFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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