Find all School-related info fast with the new School-Specific MBA Forum

It is currently 25 Nov 2015, 16:55
GMAT Club Tests


GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

for You

we will pick new questions that match your level based on your Timer History

Your Progress

every week, we’ll send you an estimated GMAT score based on your performance


we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

circular perm

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
User avatar
Joined: 21 Jan 2007
Posts: 2756
Location: New York City
Followers: 9

Kudos [?]: 480 [0], given: 4

circular perm [#permalink] New post 13 Mar 2008, 08:43



Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
6 guys (let's call them ABCDEF) sit around a circular table. If the AB must always sit together, and C must face the door, how many arrangements are possible? please explain your work...

You tried your best and you failed miserably. The lesson is 'never try'. -Homer Simpson

Expert Post
User avatar
Joined: 17 Nov 2007
Posts: 3573
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 447

Kudos [?]: 2501 [0], given: 359

GMAT ToolKit User Premium Member
Re: circular perm [#permalink] New post 13 Mar 2008, 09:19
Expert's post

1. "C must face the door" - the condition fixes circular shifts.
2. "the AB must always sit together" - we can consider AB one object, but count it twice as AB and BA .
3. We have 4 objects (3 guys and one couple :)): 4P4=4!=24
4. finally, N=24*2=48

HOT! GMAT TOOLKIT 2 (iOS) / GMAT TOOLKIT (Android) - The OFFICIAL GMAT CLUB PREP APP, a must-have app especially if you aim at 700+ | PrepGame

Senior Manager
Senior Manager
Joined: 15 Aug 2007
Posts: 252
Schools: Chicago Booth
Followers: 1

Kudos [?]: 59 [0], given: 0

Re: circular perm [#permalink] New post 13 Mar 2008, 10:32
48 it is

It looks like a circular permutation problem, but is a liner instead.
Joined: 27 Jul 2010
Posts: 197
Location: Prague
Schools: University of Economics Prague
Followers: 1

Kudos [?]: 27 [0], given: 15

GMAT ToolKit User
Re: circular perm [#permalink] New post 20 Jan 2011, 08:49
Is it linear because the one guy must face the door?

You want somethin', go get it. Period!

Re: circular perm   [#permalink] 20 Jan 2011, 08:49
    Similar topics Author Replies Last post
A circular jogging track forms the edge of a circular lake that has a novice12 2 18 Oct 2015, 08:41
A circular rim GMATD11 1 10 Feb 2011, 23:59
1 circular rim metallicafan 2 13 Jul 2010, 20:41
5 Experts publish their posts in the topic A circular mat with diameter 20 inches is placed on a square saviop 5 19 Nov 2007, 18:03
3 Tanks A and B are each in the shape of a right circular sperumba 6 18 Jan 2006, 19:11
Display posts from previous: Sort by

circular perm

  Question banks Downloads My Bookmarks Reviews Important topics  

GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.