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

It is currently 31 Jul 2014, 19:56

Close

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.

Customized
for You

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

Track
Your Progress

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

Practice
Pays

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

A very very difficult math

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 21 Aug 2011
Posts: 26
Followers: 0

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

A very very difficult math [#permalink] New post 24 Aug 2011, 01:02
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

30% (00:00) correct 70% (00:57) wrong based on 10 sessions
A photographer will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row. The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her. How many such arrangements of the 6 people are possible?

(A) 5
(B) 6
(C) 9
(D) 24
(E) 36


Well, this has been discussed before, however people just give some examples , can someone explain any formular to solve this problem in an easy way???

like 3P3, or 3C3 to calculate ways to arrange people.
[Reveal] Spoiler: OA
Manager
Manager
avatar
Status: Quant 50+?
Joined: 02 Feb 2011
Posts: 107
Concentration: Strategy, Finance
Schools: Tuck '16, Darden '16
Followers: 1

Kudos [?]: 23 [0], given: 22

Re: A very very difficult math [#permalink] New post 24 Aug 2011, 07:53
Not really an exact formula for it.

1 has to be bottom left and 6 has to be top right. Once you fill in slot two and three on the bottom row you have no choices for slot 4 and 5 on the top row (they fall into place). Now you only have two slots to play with in order to see the number of combos.


Should be easy to find 123456 124356 125346 134256 135246 in 30 seconds
Intern
Intern
avatar
Joined: 21 Aug 2011
Posts: 26
Followers: 0

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

Re: A very very difficult math [#permalink] New post 24 Aug 2011, 18:00
You are wrong!!!!

It should be 6. Brother~


eragotte wrote:
Not really an exact formula for it.

1 has to be bottom left and 6 has to be top right. Once you fill in slot two and three on the bottom row you have no choices for slot 4 and 5 on the top row (they fall into place). Now you only have two slots to play with in order to see the number of combos.


Should be easy to find 123456 124356 125346 134256 135246 in 30 seconds
Math Forum Moderator
avatar
Joined: 20 Dec 2010
Posts: 2048
Followers: 127

Kudos [?]: 887 [0], given: 376

GMAT Tests User
Re: A very very difficult math [#permalink] New post 25 Aug 2011, 05:08
Jasonammex wrote:
A photographer will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row. The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her. How many such arrangements of the 6 people are possible?

(A) 5
(B) 6
(C) 9
(D) 24
(E) 36


Well, this has been discussed before, however people just give some examples , can someone explain any formular to solve this problem in an easy way???

like 3P3, or 3C3 to calculate ways to arrange people.


Jasonammex is banned permanently for continuously creating a new thread with a question that's already discussed, despite multiple warnings. Also, the user creates a new user-id as soon as he/she is banned.
_________________

~fluke

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: A very very difficult math   [#permalink] 25 Aug 2011, 05:08
    Similar topics Author Replies Last post
Similar
Topics:
Very Poor Math Performance chicagocubsrule 8 13 Nov 2008, 14:09
2 Combinatorics (very difficult) lordw 4 08 Sep 2008, 08:39
Very Very Basic Math Question jimmyjamesdonkey 11 11 Jun 2007, 06:04
It is very difficult to prove today that a painting done two WinWinMBA 5 26 May 2005, 11:22
It is very difficult to prove today that a painting done two doggita 5 07 Dec 2004, 20:01
Display posts from previous: Sort by

A very very difficult math

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

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®.