Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Nov 2007:30 AM PST
-08:30 AM PST
Learn what truly sets the UC Riverside MBA apart and how it helps in your professional growth
Nov 2211:00 AM IST
-01:00 PM IST
Do RC/MSR passages scare you? e-GMAT is conducting a masterclass to help you learn – Learn effective reading strategies Tackle difficult RC & MSR with confidence Excel in timed test environment- Nov 23
11:00 AM IST
-01:00 PM IST
Attend this free GMAT Algebra Webinar and learn how to master the most challenging Inequalities and Absolute Value problems with ease. 
Nov 2510:00 AM EST
-11:00 AM EST
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors.
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
57% (02:05) correct
43%
(02:10)
wrong
based on 95
sessions
History
Date
Time
Result
Not Attempted Yet
Each of the 30 students in a class is either male or female, and has blonde, brown, or red hair. If one student is to be randomly selected from the class, what is the probability that the student will either be female or have brown hair?
(1) The probability that the student will both be female and have brown hair is 0.1.
(2) The probability that the student will be female minus the probability that the student will have brown hair is 0.25.
Source: Jeff Sackmann's GMAT Extreme Challenge
(1) The probability that the student will both be female and have brown hair is 0.1.
(2) The probability that the student will be female minus the probability that the student will have brown hair is 0.25.
Source: Jeff Sackmann's GMAT Extreme Challenge
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
21 Sep 2009, 19:36
Kudos
Bookmarks
We have to find the following probability:
P(Female or Brown Hair)=P(Female)+P(Brown hair)-P(Female with brown hair)
Statement 1 - gives the value of P(Female with brown hair)=10% but we do not know P(Female) and P(Brown hair).
Statement 2 - states that P(Female)-P(Brown hair)=25%. not sufficient since we do not know P(female with brown hair) and we do not know either P(female) or P(brown hair)
Combined - still not sufficient. We need to know either P(Female) or P(Brown hair) in order to solve for P(Female or Brown hair)
Answer is E.
P(Female or Brown Hair)=P(Female)+P(Brown hair)-P(Female with brown hair)
Statement 1 - gives the value of P(Female with brown hair)=10% but we do not know P(Female) and P(Brown hair).
Statement 2 - states that P(Female)-P(Brown hair)=25%. not sufficient since we do not know P(female with brown hair) and we do not know either P(female) or P(brown hair)
Combined - still not sufficient. We need to know either P(Female) or P(Brown hair) in order to solve for P(Female or Brown hair)
Answer is E.
21 Sep 2009, 21:28
Kudos
Bookmarks
This question is, mathematically speaking, essentially identical to a GMATPrep problem
