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How many ways can four married couples sit on a park bench

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Director
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How many ways can four married couples sit on a park bench [#permalink] New post 08 Dec 2004, 15:58
How many ways can four married couples sit on a park bench if every husband and wife must sit together?
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 [#permalink] New post 08 Dec 2004, 17:35
4!*2^4...did i miss something
Director
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 [#permalink] New post 08 Dec 2004, 18:10
foraj wrote:
4!*2^4...did i miss something


It is the right answer. Can you please explain 2^4? Thanks.
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 [#permalink] New post 08 Dec 2004, 19:05
My understanding is..
1. group the pairs . We will have 4 pairs of husbands and wifes and they can be arranged in 4! ways.
2. Each pair can be arranged in 2! ways.

So 4!*2!*2!*2!*2! = 24 *16 = 384
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 [#permalink] New post 08 Dec 2004, 19:47
thanks, get it now! :-D
  [#permalink] 08 Dec 2004, 19:47
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How many ways can four married couples sit on a park bench

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