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

It is currently 25 May 2013, 12:55
Customize  |  Hide

Search
Register
New posts
Unanswered

The probability of pulling a black ball out of a glass jar

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
Director
Director
Joined: 22 Aug 2007
Posts: 576
Followers: 1

Kudos [?]: 5 [0], given: 0

GMAT Tests User
The probability of pulling a black ball out of a glass jar [#permalink] New post 22 Sep 2007, 09:31
The probability of pulling a black ball out of a glass jar is 1/X. The probability of pulling a black ball out of a glass jar and breaking the jar is 1/Y. What is the probability of breaking the jar?
a) 1/(XY).
b) X/Y.
c) Y/X.
d) 1/(X+Y).
e) 1/(X-Y).
VP
VP
Joined: 10 Jun 2007
Posts: 1478
Followers: 5

Kudos [?]: 70 [0], given: 0

GMAT Tests User
Re: combination_break it [#permalink] New post 22 Sep 2007, 09:55
IrinaOK wrote:
The probability of pulling a black ball out of a glass jar is 1/X. The probability of pulling a black ball out of a glass jar and breaking the jar is 1/Y. What is the probability of breaking the jar?
a) 1/(XY).
b) X/Y.
c) Y/X.
d) 1/(X+Y).
e) 1/(X-Y).


I got b
P(black)=1/x
P(break and black)=1/y=P(black)xP(break)
P(break)= x/y
Director
Director
Joined: 11 Jun 2007
Posts: 938
Followers: 1

Kudos [?]: 18 [0], given: 0

GMAT Tests User
Re: combination_break it [#permalink] New post 22 Sep 2007, 09:57
IrinaOK wrote:
The probability of pulling a black ball out of a glass jar is 1/X. The probability of pulling a black ball out of a glass jar and breaking the jar is 1/Y. What is the probability of breaking the jar?
a) 1/(XY).
b) X/Y.
c) Y/X.
d) 1/(X+Y).
e) 1/(X-Y).


A = probability of pulling a black ball out of a glass jar 1/X
B = probability of breaking the jar
C = pulling a black ball out of a glass jar and breaking the jar 1/Y

A * B = C

solve for B: B = C / A
B = (1/Y) / (1/X)
B = X /Y (answer B)
Current Student
Joined: 28 Dec 2004
Posts: 3439
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 11

Kudos [?]: 134 [0], given: 2

GMAT Tests User
 [#permalink] New post 22 Sep 2007, 10:05
i got B too...

prob of pulling ball 1/x

prob of breaking jar 1/n

prob of pulling ball AND breaking jar 1/y

1/x * 1/n =1/y

1/n=x/y
  [#permalink] 22 Sep 2007, 10:05
    Similar topics Author Replies Last post
Similar
Topics:
 New posts The probability of pulling a black ball out of a glass jar cloaked_vessel 6 13 Mar 2005, 14:02
New posts The probability of pulling a black ball out of a glass jar sperumba 4 26 Jan 2006, 18:17
New posts The probability of pulling a black bal out of a glass jar is andrecrompton 2 10 Jul 2006, 17:58
New posts 2 A jar contains only x black balls and y white balls tejal777 3 06 Jun 2009, 04:54
New posts 1 EXPERTS_POSTS_IN_THIS_TOPIC The probability of pulling a black ball out of a glass jar anilnandyala 2 17 Dec 2010, 05:39
Display posts from previous: Sort by

The probability of pulling a black ball out of a glass jar

  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