Combinatorics : GMAT Problem Solving (PS)
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# Combinatorics

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Manager
Joined: 24 Dec 2009
Posts: 224
Followers: 2

Kudos [?]: 40 [0], given: 3

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21 Oct 2010, 13:10
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Difficulty:

(N/A)

Question Stats:

60% (01:02) correct 40% (00:21) wrong based on 5 sessions

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Hi,

[Reveal] Spoiler: OA

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Manager
Joined: 03 Sep 2010
Posts: 75
Location: Israel
GMAT 1: 660 Q47 V34
GMAT 2: 670 Q48 V34
GPA: 3.2
WE: Operations (Non-Profit and Government)
Followers: 3

Kudos [?]: 32 [0], given: 2

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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.
Retired Moderator
Joined: 02 Sep 2010
Posts: 805
Location: London
Followers: 108

Kudos [?]: 971 [0], given: 25

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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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