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6 persons seat themselves at round table. What is the

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Manager
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6 persons seat themselves at round table. What is the [#permalink] New post 09 Oct 2003, 20:41
6 persons seat themselves at round table. What is the probability that 2 given persons are adjacent?
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Re: Probability#14 [#permalink] New post 09 Oct 2003, 23:48
araspai wrote:
6 persons seat themselves at round table. What is the probability that 2 given persons are adjacent?


If two persons are adjacent, # of ways ... 4! * 2

Total ways = 5!

prob = 4! *2 /5!

Please check my work

thanks
praetorian

Last edited by Praetorian on 09 Oct 2003, 23:50, edited 1 time in total.
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 [#permalink] New post 13 Oct 2003, 22:36
agree
two are adjacent = 2!*4!
total combinations = 5!

P=2!*4!/5!=2/5

Last edited by stolyar on 15 Oct 2003, 22:02, edited 1 time in total.
  [#permalink] 13 Oct 2003, 22:36
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