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

It is currently 02 Sep 2015, 23:03
GMAT Club Tests

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 certain junior class has 1000 students and a certain

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 31 Mar 2006
Posts: 163
Followers: 1

Kudos [?]: 12 [0], given: 0

A certain junior class has 1000 students and a certain [#permalink] New post 20 May 2006, 04:45
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A certain junior class has 1000 students and a certain senior class has 800 students. Among these students, there are 60 sibling pairs eac consisting 1 junior and 1 senior. If 1 student is to be selected at random from each class, what is the probabilty that the 2 students selected will be a sibling pair?


Please explain. Thanks
Director
Director
avatar
Joined: 16 Aug 2005
Posts: 946
Location: France
Followers: 1

Kudos [?]: 13 [0], given: 0

 [#permalink] New post 20 May 2006, 04:57
This has been discussed many times before:

Total pairs = 1000x800
Out of which sibling pairs = 60

So, probability = 60/800000 = 3/40000
  [#permalink] 20 May 2006, 04:57
Display posts from previous: Sort by

A certain junior class has 1000 students and a certain

  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®.