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(9) distinct people are to be seated in a row. Two particular people must have exactly (3) people between them. How many arrangements are possible?

Answer and explanation

Correct answer: (20160)

The two particular people occupy positions (4) apart, giving (5) position pairs and (2) orders, then arrange the remaining (7!). Count position pairs for distance constraints.

Related tags

PermutationsClass11ExpertPosition ConstraintPermutations And CombinationsMathematicsClass 11 Mcq

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