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hi friends. please answer this question as soon as possible

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+1 vote
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in Mathematics by (25 points)

12 people are to be seated in 12 chairs arranged around a circle. If 2 of the people refused to sit next to each other, the number of ways 12 people could be seated is?angryangrycrying

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1 Answer

+1 vote
by (284 points)

Arrangements of 12 persons =11!

2 persons can not seat together  = 11! − 10!(2)

⇒10!(11−2)=9(10!)​

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