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In how many different ways (relative to each other) can 8

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Senior Manager
Senior Manager
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Status: struggling with GMAT
Joined: 06 Dec 2012
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Location: Bangladesh
Concentration: Accounting
GMAT Date: 04-06-2013
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Kudos [?]: 99 [0], given: 46

In how many different ways (relative to each other) can 8 [#permalink] New post 28 Feb 2013, 11:24
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In how many different ways (relative to each other) can 8 friends sit around a square table with 2 seats on each side of the table?
answer is 2*7!
need the explanation..........I an not understanding how to solve
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Affiliations: GMAT Prepster and Stratus Prep
Joined: 16 Jan 2013
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Concentration: Finance, Entrepreneurship
GMAT 1: 770 Q50 V46
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Re: In how many different ways (relative to each other) can 8 [#permalink] New post 28 Feb 2013, 12:44
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Normally the formula for items in a circle is (n-1)! - in this case this is the 7!

It is multiplied by 2 because of the rest of the information. If you have the same arrangement of people you can have everyone shift one position to the right (or left) and they will be sitting next to a different person. With 2 shifts they will be back to sitting next to the original person.

Hope this helps.
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If my response helps, please add throw me a kudos.

Jim Kernan is the Director of GMAT Operations at Stratus Prep and author of GMAT Materials for GMAT Prepster.

Re: In how many different ways (relative to each other) can 8   [#permalink] 28 Feb 2013, 12:44
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