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# Combinatorics

Author Message
Manager
Joined: 24 Dec 2009
Posts: 213

Kudos [?]: 49 [0], given: 3

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21 Oct 2010, 14:10
00:00

Difficulty:

(N/A)

Question Stats:

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

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Hi,

[Reveal] Spoiler: OA

Attachments

combinatorics-prep1.jpg [ 61.91 KiB | Viewed 1429 times ]

Kudos [?]: 49 [0], given: 3

Manager
Joined: 03 Sep 2010
Posts: 75

Kudos [?]: 34 [0], given: 2

Location: Israel
GMAT 1: 660 Q47 V34
GMAT 2: 670 Q48 V34
GPA: 3.2
WE: Operations (Non-Profit and Government)

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21 Oct 2010, 14:38
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.

Kudos [?]: 34 [0], given: 2

Retired Moderator
Joined: 02 Sep 2010
Posts: 793

Kudos [?]: 1211 [0], given: 25

Location: London

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21 Oct 2010, 15:13
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
_________________

Kudos [?]: 1211 [0], given: 25

Re: Combinatorics   [#permalink] 21 Oct 2010, 15:13
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