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Jacobagel

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Unable to do the following question. Could someone please provide an explanation:
Eight people are to form two queues of four. In how many ways can this be done if Sean and Liam must stand in the same queue?
ANSWER: 17,280
 

fan96

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If the queues are distinct, then we should have


or



(Fix Sean and Liam in one queue, then pick four people from the remaining six for the other queue. Arrange ways for each queue, and finally double to account for the distinct queues.)
 

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