NEW HERE? LEARN MORE
closeclose
Last visit was: 25 Apr 2024, 15:39 It is currently 25 Apr 2024, 15:39
Decision Tracker
My Rewards
New posts
New comers' posts

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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

2 of the 5 production lines are defective. If 2 lines

User avatar
DLMD
Manager
Manager
Joined: 07 Nov 2004
Posts: 218
Own Kudos [?]: 862 [0]
Given Kudos: 0
Send PM
2 of the 5 production lines are defective. If 2 lines [#permalink] New post   03 Feb 2005, 12:56
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Hide Show timer Statistics
2 of the 5 production lines are defective. If 2 lines selected randomly, what is the probability that both of them are defective?



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 Problem Solving (PS) 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!
User avatar
DLMD
Manager
Manager
Joined: 07 Nov 2004
Posts: 218
Own Kudos [?]: 862 [0]
Given Kudos: 0
Send PM
Re: 2 of the 5 production lines are defective. If 2 lines [#permalink] New post   03 Feb 2005, 17:29
DLMD wrote:
C (3,2) / C (5,2)


this is OA, heck, I dont' understand neither
avatar
HongHu
Director
Director
Joined: 03 Jan 2005
Posts: 971
Own Kudos [?]: 769 [0]
Given Kudos: 0
Send PM
Re: 2 of the 5 production lines are defective. If 2 lines [#permalink] New post   03 Feb 2005, 21:09
This would be correct is the question is:

2 of the 5 production lines are defective. If 2 lines selected randomly, what is the probability that none of them are defective?
User avatar
Antmavel
Current Student
Joined: 13 Jun 2004
Posts: 583
Own Kudos [?]: 132 [0]
Given Kudos: 0
Location: London, UK
Schools:Tuck'08
Send PM
Re: 2 of the 5 production lines are defective. If 2 lines [#permalink] New post   03 Feb 2005, 21:24
2 of the 5 production lines are defective. If 2 lines selected randomly, what is the probability that both of them are defective? (initial post)

-> 1/5 * 1/4 = 1/20

2 of the 5 production lines are defective. If 2 lines selected randomly, what is the probability that none of them are defective? (Honghu post)

-> 3/5 * 2/4 = 3/10
User avatar
Antmavel
Current Student
Joined: 13 Jun 2004
Posts: 583
Own Kudos [?]: 132 [0]
Given Kudos: 0
Location: London, UK
Schools:Tuck'08
Send PM
Re: 2 of the 5 production lines are defective. If 2 lines [#permalink] New post   03 Feb 2005, 22:28
sorry, I made a mistake, goes too fast :wink:

There are 2 defective production lines
The total of production lines is 5 so we can find that there are 3 productions lines running without any problems.

2 of the 5 production lines are defective. If 2 lines selected randomly, what is the probability that both of them are defective? (initial post)

:!: shoud be 2/5*1/4 = 1/10

2 of the 5 production lines are defective. If 2 lines selected randomly, what is the probability that none of them are defective? (Honghu post)

3/5*2/4= 3/10

sorry for the mistake



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 Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
GMAT Club Bot
gmatclubot
Re: 2 of the 5 production lines are defective. If 2 lines [#permalink]
03 Feb 2005, 22:28
Moderators:
Bunuel
Math Expert
92915 posts
yashikaaggarwal
Senior Moderator - Masters Forum
3137 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions