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Combinatorics

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Manager
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Combinatorics [#permalink] New post 21 Oct 2010, 13:10
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

67% (01:03) correct 33% (00:42) wrong based on 3 sessions
Hi,

Please help me solve this. Thanks.
[Reveal] Spoiler: OA

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Re: Combinatorics [#permalink] New post 21 Oct 2010, 13:38
It took me time to get to it, but I think I've got it:

Because the question talks about a circular table it doesn't matter where the first person will seat (it onley matters who seats near him), hence the equation should be 4*3*2*1=24.
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Re: Combinatorics [#permalink] New post 21 Oct 2010, 14:13
The number of ways to arrange n objects around a table is (n-1)!

For more details about this formula, refer to the combinatorics section of the math book : gmat-math-book-87417.html

The answer here is n=5, hence 4! or 24
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Re: Combinatorics   [#permalink] 21 Oct 2010, 14:13
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