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 2001:30 PM EST
-02:30 PM IST
Learn how Kamakshi achieved a GMAT 675 with an impressive 96th %ile in Data Insights. Discover the unique methods and exam strategies that helped her excel in DI along with other sections for a balanced and high score.
Nov 2206:30 AM PST
-08:30 AM PST
Let’s dive deep into advanced CR to ace GMAT Focus! Join this webinar to unlock the secrets to conquering Boldface and Paradox questions with expert insights and strategies. Elevate your skills and boost your GMAT Verbal Score now!
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 2407:00 PM PST
-08:00 PM PST
Full-length FE mock with insightful analytics, weakness diagnosis, and video explanations!
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.
29 Oct 2017, 10:12
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
28% (02:00) correct
72%
(01:50)
wrong
based on 81
sessions
History
Date
Time
Result
Not Attempted Yet
Two players are to be selected from a football team which consists of 10 football players. Is the probability that both the players chosen will be left backs greater than 50 %?
(1) The probability that both players selected will not be left backs is less than 10 %
(2) More than fifty percent of the players are left backs.
Please give kudos, if u liked my post!
(1) The probability that both players selected will not be left backs is less than 10 %
(2) More than fifty percent of the players are left backs.
Please give kudos, if u liked my post!
29 Oct 2017, 20:09
Kudos
Bookmarks
souvonik2k
Hi...
A good Q..
So we have to choose 2 out of 10.
(1) The probability that both players selected will not be left backs is less than 10 %
Let there be x non left backs, so prob of choosing both is \(\frac{x}{10}*\frac{x-1}{10}<\frac{10}{100}\)...
So x(x-1)<10....
x =3 or <3 because 4*3=12>10 and 3*2=6<10...
So if x=3, left backs are 10-3=7
Prob =7/10*6/9=42/90<50%
If x=2, prob =8/10*7/9=56/90>50%
So insuff
(2) More than fifty percent of the players are left backs.
Say there are 6 or 7, as seen above itwill be <50%
And above 8,9 or 10, prob will be >50%
Insufficient
Combined..
If it is 7, Ans is NO
If 8,9 or 10, Ans is YES
Insufficient
E
27 Jul 2019, 03:41
Kudos
Bookmarks
Hi Souvonik,
While attempting word problems, the best strategy to employ is to always break down the question stem. Spending time on the question stem will help you evaluate the statements faster.
Total players= 10
The question asks us whether the probability that both players chosen will be left backs (L) is greater than 50 %
Is P(LL) > 50%
(L/10)((L - 1)/9) > 1/2 -----> L(L - 1) > 45
Now for L(L - 1) to be greater than 45, L has to be greater than or equal to 8
The question can be rephrased to 'Is L >= 8'
Statement 1 : The probability that both players selected will not be left backs (N) is less than 10 %
P(NN) < 10%
(N/10)((N - 1)/9) < 1/10 ----> N <=3 ----> L >= 7
Since L can be 7, 8, 9 or 10, we get both a YES and a NO. Insufficient.
Statement 2 : More than fifty percent of the players are left backs.
L > 5 ----> L can be 6, 7, 8, 9 and 10. Insufficient.
Combining the two statements we get L >=7, so again L can be 7, 8 , 9.... Again we get a YES and a NO. Insufficient.
Answer : E
While attempting word problems, the best strategy to employ is to always break down the question stem. Spending time on the question stem will help you evaluate the statements faster.
Total players= 10
The question asks us whether the probability that both players chosen will be left backs (L) is greater than 50 %
Is P(LL) > 50%
(L/10)((L - 1)/9) > 1/2 -----> L(L - 1) > 45
Now for L(L - 1) to be greater than 45, L has to be greater than or equal to 8
The question can be rephrased to 'Is L >= 8'
Statement 1 : The probability that both players selected will not be left backs (N) is less than 10 %
P(NN) < 10%
(N/10)((N - 1)/9) < 1/10 ----> N <=3 ----> L >= 7
Since L can be 7, 8, 9 or 10, we get both a YES and a NO. Insufficient.
Statement 2 : More than fifty percent of the players are left backs.
L > 5 ----> L can be 6, 7, 8, 9 and 10. Insufficient.
Combining the two statements we get L >=7, so again L can be 7, 8 , 9.... Again we get a YES and a NO. Insufficient.
Answer : E
