A reader searches a sertain book in three libraries : PS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 20 Jan 2017, 03:03

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# A reader searches a sertain book in three libraries

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
SVP
Joined: 03 Feb 2003
Posts: 1603
Followers: 8

Kudos [?]: 245 [0], given: 0

A reader searches a sertain book in three libraries [#permalink]

### Show Tags

03 Aug 2003, 02:16
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A reader searches a sertain book in three libraries. The probability that any library has the book equals to the probability that the library does not. The probability that the book is available in any library equals to the probability that the book is not. What is the probability that the reader will find the book?
Manager
Joined: 07 Jul 2003
Posts: 56
Followers: 1

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

### Show Tags

03 Aug 2003, 19:04
Take a look at one library
P the library has the book 1/2
P the book is available there is 1/2
So the chances of finding the book 1/2*1/2=1/4
If he does not find it there he goes to second
P of finding in the second library including P not finding in the first
1/4*3/4=3/16
and so on...
P=1/4+(1/4*3/4)+(3/4*3/4*1/4)=37/64
03 Aug 2003, 19:04
Display posts from previous: Sort by

# A reader searches a sertain book in three libraries

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 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®.