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

It is currently 02 Oct 2014, 05:21

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

If a code word is defined to be a sequence of different

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 08 Nov 2008
Posts: 38
Followers: 0

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

If a code word is defined to be a sequence of different [#permalink] New post 11 Nov 2008, 13:07
If a code word is defined to be a sequence of different letters chosen from the 10 letters A, B, C, D, E, F, G, H, I, and J, what is the ratio of the number of 5-letter code words to the number of 4-letter code words?

A. 5 to 4
B. 3 to 2
C. 2 to 1
D. 5 to 1
E. 6 to 1
SVP
SVP
avatar
Joined: 17 Jun 2008
Posts: 1579
Followers: 12

Kudos [?]: 185 [0], given: 0

Re: letter code--27 [#permalink] New post 11 Nov 2008, 23:15
stallone wrote:
e ; 10P5/10P6


It will be 10P5 / 10P4
Manager
Manager
avatar
Joined: 14 Oct 2008
Posts: 160
Followers: 1

Kudos [?]: 26 [0], given: 0

Re: letter code--27 [#permalink] New post 11 Nov 2008, 23:39
Why not 10C5 / 10C4 ? I did'nt understand how is it not combinations problem ? Number of 5 letter words can be chosen from 10 letters in 10C5 ways ??? Although I am getting the ratio to be 6/5 if use Combinations, hence it has o be incorrect. Can anyone explain pls.
Expert Post
CEO
CEO
User avatar
Joined: 17 Nov 2007
Posts: 3571
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 365

Kudos [?]: 1809 [0], given: 358

GMAT ToolKit User Premium Member
Re: letter code--27 [#permalink] New post 11 Nov 2008, 23:57
Expert's post
gameCode wrote:
Why not 10C5 / 10C4 ? I did'nt understand how is it not combinations problem ? Number of 5 letter words can be chosen from 10 letters in 10C5 ways ??? Although I am getting the ratio to be 6/5 if use Combinations, hence it has o be incorrect. Can anyone explain pls.


ABCDE and ABCED is different codes as the problem says: "a sequence of different letters"

Faster solution: We can create 5-letters code from 4-letters code by adding one letter of 10-4=6 letters. So, 6 to 1.
_________________

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

Re: letter code--27   [#permalink] 11 Nov 2008, 23:57
    Similar topics Author Replies Last post
Similar
Topics:
If a code word is defined to be a sequence of different tarek99 4 14 Apr 2008, 12:09
If a code word is defined to be a sequence of different marcodonzelli 3 19 Jan 2008, 05:09
If a code word is defined to be a sequence of different gmatornot 4 23 Aug 2006, 19:36
If a code word is defined to be a sequence of different GMATCUBS21 6 23 Jun 2006, 14:35
If a code word is defined to be a sequence of different M8 3 25 Apr 2006, 11:21
Display posts from previous: Sort by

If a code word is defined to be a sequence of different

  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®.