Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 19 May 2013, 04:08
Customize  |  Hide

Search
Register
New posts
Unanswered

A certain stock exchange designates each stock with a 1 , 2

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
VP
VP
Joined: 22 Nov 2007
Posts: 1108
Followers: 6

Kudos [?]: 80 [0], given: 0

GMAT Tests User
A certain stock exchange designates each stock with a 1 , 2 [#permalink] New post 21 Jan 2008, 11:01
A certain stock exchange designates each stock with a 1 , 2 or 3-letter code, where each letter is selected from the 26 letters of the alphabet. If the letters may be repeated and if the same letters used in a different order constitute a different code , how many different stocks is it possible to uniquely designate with these codes?

A.2951
B.8125
C.15600
D.16302
E.18278
Director
Director
Joined: 01 Jan 2008
Posts: 635
Followers: 3

Kudos [?]: 114 [0], given: 1

GMAT Tests User
Re: repetition [#permalink] New post 21 Jan 2008, 11:23
26^1+26^2+26^3 = 18,278 (E)
1 KUDOS received
CEO
CEO
User avatar
Joined: 29 Mar 2007
Posts: 2618
Followers: 13

Kudos [?]: 142 [1] , given: 0

GMAT Tests User
Re: repetition [#permalink] New post 21 Jan 2008, 19:07
1
This post received
KUDOS
marcodonzelli wrote:
A certain stock exchange designates each stock with a 1 , 2 or 3-letter code, where each letter is selected from the 26 letters of the alphabet. If the letters may be repeated and if the same letters used in a different order constitute a different code , how many different stocks is it possible to uniquely designate with these codes?

A.2951
B.8125
C.15600
D.16302
E.18278


26 for the first letter 26^2 for the second 26^3 for the third.

26+26^2+26^3.

To elim the need for calculations just realize that the units digit will be 6 and there are three 6's.

So the units digit will be 8.


E
VP
VP
Joined: 22 Nov 2007
Posts: 1108
Followers: 6

Kudos [?]: 80 [0], given: 0

GMAT Tests User
Re: repetition [#permalink] New post 18 Mar 2008, 09:03
GMATBLACKBELT wrote:
marcodonzelli wrote:
A certain stock exchange designates each stock with a 1 , 2 or 3-letter code, where each letter is selected from the 26 letters of the alphabet. If the letters may be repeated and if the same letters used in a different order constitute a different code , how many different stocks is it possible to uniquely designate with these codes?

A.2951
B.8125
C.15600
D.16302
E.18278


26 for the first letter 26^2 for the second 26^3 for the third.

26+26^2+26^3.

To elim the need for calculations just realize that the units digit will be 6 and there are three 6's.

So the units digit will be 8.


E


so we have permutations with repetitions. given 26 elements we want to select them no more than 3 times (1,2,3 letter codes), with repetitions allowed. thus we have 26+26^2+26^3, simply as it is
Re: repetition   [#permalink] 18 Mar 2008, 09:03
    Similar topics Author Replies Last post
Similar
Topics:
 New posts A certain stock exchange designates each stock with one, two getzgetzu 3 26 Apr 2006, 02:33
New posts stock lnaik 6 27 Sep 2007, 14:41
Popular new posts EXPERTS_POSTS_IN_THIS_TOPIC A certain stock exchange designates each stock with a 1,2 or marcodonzelli 10 19 Dec 2007, 06:09
New posts 4 A certain stock exchange designates each stock with a one-, japped187 3 30 May 2008, 06:19
New posts 6 EXPERTS_POSTS_IN_THIS_TOPIC A certain stock exchange designates each stock with a 1, 2 chicagocubsrule 9 10 Nov 2009, 15:50
Display posts from previous: Sort by

A certain stock exchange designates each stock with a 1 , 2

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: Bunuel, VeritasPrepKarishma

Search for:


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®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com