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(7) distinct people are to be seated in a circle. Two particular people must be adjacent and two other particular people must not be adjacent. How many arrangements are possible?

Answer and explanation

Correct answer: (360)

Make the first pair a block giving (2\cdot5!), then subtract cases where the second pair is adjacent, (2\cdot2\cdot4!). Use block and subtraction together in mixed circular constraints.

Related tags

PermutationsClass11ExpertCircular ConstraintsPermutations And CombinationsMathematicsClass 11 Mcq

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