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How many different ways can they be seated?

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Senior Manager
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Joined: 29 Jun 2010
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Schools: LBS, Oxford
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How many different ways can they be seated? [#permalink] New post 15 Jul 2011, 01:22
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Difficulty:

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Question Stats:

69% (01:15) correct 31% (00:16) wrong based on 13 sessions
If 6 ministers are to be seated at a round table conference, then how many different ways can they be seated?

24
60
120
720
180
[Reveal] Spoiler: OA
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Joined: 26 May 2005
Posts: 571
Followers: 18

Kudos [?]: 116 [0], given: 13

Re: How many different ways can they be seated? [#permalink] New post 15 Jul 2011, 01:27
Alchemist1320 wrote:
If 6 ministers are to be seated at a round table conference, then how many different ways can they be seated?

24
60
120
720
180



Simple formula:
There are (n - 1)! ways to arrange n distinct objects in a circle.

so its (6-1)! = 5! = 120
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Re: How many different ways can they be seated? [#permalink] New post 15 Jul 2011, 03:32
(n-1)! for circular arrangements. 5! = 120
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Re: How many different ways can they be seated? [#permalink] New post 16 Jul 2011, 02:25
You can also think of it as .. lets pick 1 minister and make him sit anywhere, now 5 ministers are left that need to seated around this minister and this can be done in 5! ways. The n-1 comes from fixing one person/thing in the arrangement already.
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Re: How many different ways can they be seated?   [#permalink] 16 Jul 2011, 02:25
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