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

It is currently 16 Sep 2014, 13:33

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

Someone is trying to remember a phone number but cannot

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 11 Jan 2007
Posts: 204
Location: Bangkok
Followers: 1

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

GMAT Tests User
Someone is trying to remember a phone number but cannot [#permalink] New post 28 Jul 2007, 08:49
14. Someone is trying to remember a phone number but cannot remember the whole number. He remembers 296-xxxx. He also remembers that the last 4 numbers must contain two 3 and a 8 and a 7. How many possible combinations are there?
A.8
B.10
C.12
D.15
E.18
_________________

cool

Director
Director
User avatar
Joined: 08 Feb 2007
Posts: 610
Location: New Haven, CT
Followers: 5

Kudos [?]: 17 [0], given: 0

GMAT Tests User
 [#permalink] New post 28 Jul 2007, 09:25
4!/2! or 12

4! since there are four numbers

2! since three is a repeat.
Manager
Manager
avatar
Joined: 08 Jul 2007
Posts: 174
Followers: 1

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

GMAT Tests User
 [#permalink] New post 28 Jul 2007, 09:29
C.

There are 4!=24 ways to arrange the four numbers without the "3 restriction". Because of of the "3 restriction", 1/2 of those arrangments are repeats. So there are 24/12=12 combinations.
Senior Manager
Senior Manager
avatar
Joined: 04 Jun 2007
Posts: 350
Followers: 1

Kudos [?]: 14 [0], given: 0

GMAT Tests User
 [#permalink] New post 28 Jul 2007, 09:53
Clear C.

4!/2! = 24/2 = 12.
  [#permalink] 28 Jul 2007, 09:53
    Similar topics Author Replies Last post
Similar
Topics:
Can someone please rate my essay? It's my first try! pohkid 0 09 Sep 2014, 14:26
can someone provide me with more info on this? i remember bmwhype2 2 04 Oct 2007, 08:44
I remember seeing this problem before but I cannot find it javed 5 04 May 2007, 01:52
A phone company is creating new, 7-digit phone numbers for a GMATT73 1 07 Oct 2005, 07:44
Bob cannot completely remember his four-digit ATM pin AJB77 2 03 Jul 2005, 09:48
Display posts from previous: Sort by

Someone is trying to remember a phone number but cannot

  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®.