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.
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2711:00 AM EDT
-12:00 PM EDT
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
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
30 Jul 2003, 20:04
Kudos
Bookmarks
Martin has a drawer containing 14 red socks,18 blue scoks and some green socks,all mixed up together.If Martin pulls out one socks,the probability that it will be green is 1/3.
1)How many green socks are in the drawer.
2)If he takes out 3 socks,what is the probaility that he will get a matching pair.
3)If he takes out 2 socks ,what is the probability that he will get a matching pair.
Sanjay
1)How many green socks are in the drawer.
2)If he takes out 3 socks,what is the probaility that he will get a matching pair.
3)If he takes out 2 socks ,what is the probability that he will get a matching pair.
Sanjay
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 Quantitative Questions 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!
30 Jul 2003, 21:22
Kudos
Bookmarks
Martin has a drawer containing 14 red socks,18 blue scoks and some green socks,all mixed up together.If Martin pulls out one socks,the probability that it will be green is 1/3.
1)How many green socks are in the drawer.
2)If he takes out 3 socks,what is the probaility that he will get a matching pair.
3)If he takes out 2 socks ,what is the probability that he will get a matching pair.
1) let # of green socks be x
p(green sock pulled) = x/(14+18+x) = 1/3
Solving, x= 16
2) p(will get a matching pair out of 3 socks)
= 1 - p(three socks are unique)
= 1 - ((14*16*18)/(48*47*46))
= 1039/1081
3) P (will get a matching pair out of 2 socks)
= p(both red) + p(both blue) + p(both green)
= (14/48)*(13/47) + (18/48)*(17/47) + (16/48)*(15/47)
= 91/262
Akamai, please comment. Thanx
1)How many green socks are in the drawer.
2)If he takes out 3 socks,what is the probaility that he will get a matching pair.
3)If he takes out 2 socks ,what is the probability that he will get a matching pair.
1) let # of green socks be x
p(green sock pulled) = x/(14+18+x) = 1/3
Solving, x= 16
2) p(will get a matching pair out of 3 socks)
= 1 - p(three socks are unique)
= 1 - ((14*16*18)/(48*47*46))
= 1039/1081
3) P (will get a matching pair out of 2 socks)
= p(both red) + p(both blue) + p(both green)
= (14/48)*(13/47) + (18/48)*(17/47) + (16/48)*(15/47)
= 91/262
Akamai, please comment. Thanx
31 Jul 2003, 04:34
Kudos
Bookmarks
I think the solution for the 2 task is the following:
p=1-1C14*1C18*1C16/3C48=1-(14*18*16)/(48!/(3!*45!)=
=1-(14*18*16)/(8*47*46)=829/1081 or about 77%
I hope I am right...
Regards,
Hopeful
p=1-1C14*1C18*1C16/3C48=1-(14*18*16)/(48!/(3!*45!)=
=1-(14*18*16)/(8*47*46)=829/1081 or about 77%
I hope I am right...
Regards,
Hopeful
