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

It is currently 29 Aug 2014, 00:28

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

There are 4 books on physics and 2 books on maths.Find the

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 29 Aug 2003
Posts: 29
Location: Mumbai
Followers: 0

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

There are 4 books on physics and 2 books on maths.Find the [#permalink] New post 11 Dec 2003, 03:39
There are 4 books on physics and 2 books on maths.Find the no. of ways in which these books can be arranged so that the books on maths are not together!
Director
Director
avatar
Joined: 13 Nov 2003
Posts: 801
Location: BULGARIA
Followers: 1

Kudos [?]: 19 [0], given: 0

GMAT Tests User
 [#permalink] New post 11 Dec 2003, 03:46
6!-4!x3!=720-144=576... :)
Senior Manager
Senior Manager
avatar
Joined: 12 Oct 2003
Posts: 252
Location: USA
Followers: 1

Kudos [?]: 5 [0], given: 0

GMAT Tests User
 [#permalink] New post 11 Dec 2003, 04:01
please explain ...
Intern
Intern
avatar
Joined: 29 Aug 2003
Posts: 29
Location: Mumbai
Followers: 0

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

 [#permalink] New post 11 Dec 2003, 05:46
No..this is not the answer!!! Its 480.
I m wondering how to get 480???
Director
Director
avatar
Joined: 13 Nov 2003
Posts: 801
Location: BULGARIA
Followers: 1

Kudos [?]: 19 [0], given: 0

GMAT Tests User
 [#permalink] New post 11 Dec 2003, 05:48
total number we can order the 6 books is 6!. When we take 4 maths together as one and the other 2 we can order these in 3! ways but for each of these orderings we will have 4! orderings of the 4 math books. Total number when maths are not together is 6!-4!x3!
Director
Director
avatar
Joined: 13 Nov 2003
Posts: 801
Location: BULGARIA
Followers: 1

Kudos [?]: 19 [0], given: 0

GMAT Tests User
 [#permalink] New post 11 Dec 2003, 05:53
Sorry but I got it other way round, i calculated for 4 mats and 2 physics. :oops: . when it is 4 physics and 2 maths it should be 6!-5!x2=720-240=480
Senior Manager
Senior Manager
avatar
Joined: 12 Oct 2003
Posts: 252
Location: USA
Followers: 1

Kudos [?]: 5 [0], given: 0

GMAT Tests User
 [#permalink] New post 11 Dec 2003, 05:55
there are 4 PHYSICS books and not math books.

using BG's CORRECT LOGIC ...

2 math books as 1 + 4 other books = 5!
2 math books can be arranged in 2! = 2 ways
# of ways which have 2 math books together = 5! * 2 = 120 * 2 = 240
# of total ways = 6! = 720

# of ways which DON'T have the 2 math books together = 720 - 240 = 480
Senior Manager
Senior Manager
avatar
Joined: 12 Oct 2003
Posts: 252
Location: USA
Followers: 1

Kudos [?]: 5 [0], given: 0

GMAT Tests User
 [#permalink] New post 11 Dec 2003, 05:56
well was typing when BG already posted his correction! so you can ignore my post
CEO
CEO
avatar
Joined: 15 Aug 2003
Posts: 3470
Followers: 60

Kudos [?]: 665 [0], given: 781

Re: Probability!!! [#permalink] New post 12 Dec 2003, 23:20
4128851 wrote:
There are 4 books on physics and 2 books on maths.Find the no. of ways in which these books can be arranged so that the books on maths are not together!


total # of ways of arranging these "distinguishable" books

6! = 720

ways in which math books are ALWAYS together.

5! *2! =240

required # of ways = 720 - 240 = 480
Re: Probability!!!   [#permalink] 12 Dec 2003, 23:20
    Similar topics Author Replies Last post
Similar
Topics:
There are 7 Physics and 1 chemistry book in shelf A PiyushK 2 06 Aug 2013, 01:14
Experts publish their posts in the topic There 3 kinds of books in the library physics, chemistry and kp1811 3 14 Nov 2009, 00:04
4 Experts publish their posts in the topic Maths, Physics and chemistry books are stored on a library alimad 10 26 May 2008, 11:01
Math, Physics, and Chemistry books are stored on library GMATT73 10 16 Nov 2005, 07:07
If 4 books are to be selected randomly from 2 hardback books DLMD 3 31 May 2005, 21:53
Display posts from previous: Sort by

There are 4 books on physics and 2 books on maths.Find the

  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®.