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

It is currently 24 Oct 2014, 13:30

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

mathematics course

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 10 Oct 2010
Posts: 7
Followers: 0

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

mathematics course [#permalink] New post 17 Oct 2010, 07:41
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (01:25) wrong based on 1 sessions
John and Mary are taking a mathematics course. The course has only three
grades: A, B, and C. The probability that John gets a B is .3. The probability
that Mary gets a B is .4. The probability that neither gets an A but at least
one gets a B is .1. What is the probability that at least one gets a B but
neither gets a C?
Senior Manager
Senior Manager
User avatar
Status: Time to step up the tempo
Joined: 24 Jun 2010
Posts: 410
Location: Milky way
Schools: ISB, Tepper - CMU, Chicago Booth, LSB
Followers: 7

Kudos [?]: 119 [0], given: 50

Re: mathematics course [#permalink] New post 23 Oct 2010, 18:31
abeer16 wrote:
John and Mary are taking a mathematics course. The course has only three
grades: A, B, and C. The probability that John gets a B is .3. The probability
that Mary gets a B is .4. The probability that neither gets an A but at least
one gets a B is .1. What is the probability that at least one gets a B but
neither gets a C?


Phew. Could not crack this question even after trying it for 10 minutes. Bunuel/Shrouded/Other GMATClub members -- Could you please help here?

Side note: How to bump up a thread??? Should someone just reply or is there a way to do it without replying to the post?
_________________

:good Support GMAT Club by putting a GMAT Club badge on your blog :thanks

Retired Moderator
User avatar
Joined: 02 Sep 2010
Posts: 807
Location: London
Followers: 76

Kudos [?]: 507 [0], given: 25

GMAT ToolKit User Reviews Badge
Re: mathematics course [#permalink] New post 23 Oct 2010, 19:30
I am not convinced that this question is correct

P(neither a and at least one b) = P(both b) + P(one b, one c)

But, P(both b)=0.3*0.4=0.12>0.1

So this probability cannot be 0.1

Posted from my mobile device Image
_________________

Math write-ups
1) Algebra-101 2) Sequences 3) Set combinatorics 4) 3-D geometry

My GMAT story

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: mathematics course   [#permalink] 23 Oct 2010, 19:30
    Similar topics Author Replies Last post
Similar
Topics:
2 Experts publish their posts in the topic Extra Courses in Mathematics/ Quantitative Finance smartguydexter 4 06 Jan 2013, 19:59
application of mathematics marmoora 1 12 Aug 2009, 05:03
Mathematics courses for PhD Business (Information Systems) Ancalagon The Black 2 26 Oct 2007, 07:24
CR - Mathematical arjsingh1976 14 31 Oct 2006, 04:35
Topics in Mathematics qhoc0010 0 04 Mar 2005, 17:04
Display posts from previous: Sort by

mathematics course

  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®.