Last visit was: 03 Jun 2026, 04:13 It is currently 03 Jun 2026, 04:13
Home
Messages
MBA Fair
Tests
Schools
Events
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
User avatar
joemama142000
User avatar
Joined: 17 Oct 2005
Last visit: 16 Jun 2010
Posts: 645
Own Kudos:
1,804
Posts: 645
Kudos: 1,804
There are 8 TV sets, 6 are color and 2 are black-white. If 2 21 Mar 2006, 17:04
Kudos
Add Kudos
Bookmarks
Bookmark this Post
There are 8 TV sets, 6 are color and 2 are black-white. If 2 sets are selected at random, what is the probability that at least one of them is color set?



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!
User avatar
conocieur
User avatar
Joined: 20 Mar 2005
Last visit: 21 Nov 2006
Posts: 103
Own Kudos:
38
Location: Colombia, South America
Posts: 103
Kudos: 38
There are 8 TV sets, 6 are color and 2 are black-white. If 2 21 Mar 2006, 17:12
Kudos
Add Kudos
Bookmarks
Bookmark this Post
joemama142000
There are 8 TV sets, 6 are color and 2 are black-white. If 2 sets are selected at random, what is the probability that at least one of them is color set?
Show more


1 - (2c2 / 8c2)

= 27/28
User avatar
Msam
User avatar
Joined: 26 Feb 2006
Last visit: 23 Apr 2006
Posts: 12
Posts: 12
Kudos: 0
There are 8 TV sets, 6 are color and 2 are black-white. If 2 21 Mar 2006, 17:13
Kudos
Add Kudos
Bookmarks
Bookmark this Post
joemama142000
There are 8 TV sets, 6 are color and 2 are black-white. If 2 sets are selected at random, what is the probability that at least one of them is color set?
Show more


What is the prob. that no colour sets are chosen in 2 attempts?
2/8 *1/7= a (too lazy to do the math)


therefore, the prob. to chose at least 2 color sets is 1-a
User avatar
Angela780
User avatar
Joined: 12 Feb 2006
Last visit: 16 May 2006
Posts: 35
Own Kudos:
4
Posts: 35
Kudos: 4
There are 8 TV sets, 6 are color and 2 are black-white. If 2 24 Mar 2006, 05:03
Kudos
Add Kudos
Bookmarks
Bookmark this Post
conocieur
joemama142000
There are 8 TV sets, 6 are color and 2 are black-white. If 2 sets are selected at random, what is the probability that at least one of them is color set?

1 - (2c2 / 8c2)

= 27/28
Show more


i'm going a lil crazy, but what is 2c2 again?? ..

i had a totally different solution
User avatar
SimaQ
User avatar
Joined: 06 Feb 2006
Last visit: 24 May 2007
Posts: 430
Own Kudos:
656
Posts: 430
Kudos: 656
There are 8 TV sets, 6 are color and 2 are black-white. If 2 24 Mar 2006, 05:21
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Angela780
conocieur
joemama142000
There are 8 TV sets, 6 are color and 2 are black-white. If 2 sets are selected at random, what is the probability that at least one of them is color set?

1 - (2c2 / 8c2)

= 27/28

i'm going a lil crazy, but what is 2c2 again?? ..

i had a totally different solution
Show more


2c2 is number of ways to select 2 black/white tv sets out of 2....
User avatar
Angela780
User avatar
Joined: 12 Feb 2006
Last visit: 16 May 2006
Posts: 35
Own Kudos:
4
Posts: 35
Kudos: 4
There are 8 TV sets, 6 are color and 2 are black-white. If 2 24 Mar 2006, 05:53
Kudos
Add Kudos
Bookmarks
Bookmark this Post
SimaQ
Angela780
conocieur
joemama142000
There are 8 TV sets, 6 are color and 2 are black-white. If 2 sets are selected at random, what is the probability that at least one of them is color set?

1 - (2c2 / 8c2)

= 27/28

i'm going a lil crazy, but what is 2c2 again?? ..

i had a totally different solution

2c2 is number of ways to select 2 black/white tv sets out of 2....
Show more


ok Sima, please bear with me.. can you break the solution down step by step?
User avatar
SimaQ
User avatar
Joined: 06 Feb 2006
Last visit: 24 May 2007
Posts: 430
Own Kudos:
656
Posts: 430
Kudos: 656
There are 8 TV sets, 6 are color and 2 are black-white. If 2 24 Mar 2006, 06:07
Kudos
Add Kudos
Bookmarks
Bookmark this Post
OK....

First of all, to get the probability that at least one of the TV sets will be color we can use the following formula....

1-(the probability of choosing balck/white tv set both times)

To get that probability we have to calculate total favourable outcomes of choosing 2 black/white tv sets... which is 2c2 since we are calculating the number of ways to choose 2 tv sets out of 2....

... and divide it by the total number of possible outcomes... which is 8c2... since we have to choose 2 tv sets out of 8...

There may be other approaches, what approach did you use?
User avatar
ywilfred
User avatar
Joined: 07 Jul 2004
Last visit: 06 Mar 2012
Posts: 1,987
Own Kudos:
2,058
Location: Singapore
Posts: 1,987
Kudos: 2,058
There are 8 TV sets, 6 are color and 2 are black-white. If 2 24 Mar 2006, 08:47
Kudos
Add Kudos
Bookmarks
Bookmark this Post
P(at least 1 is color) = 1 - P(both are black-white) = 1 - (2/8)(1/7) = 27/78
User avatar
Angela780
User avatar
Joined: 12 Feb 2006
Last visit: 16 May 2006
Posts: 35
Own Kudos:
4
Posts: 35
Kudos: 4
There are 8 TV sets, 6 are color and 2 are black-white. If 2 24 Mar 2006, 12:07
Kudos
Add Kudos
Bookmarks
Bookmark this Post
SimaQ
OK....

First of all, to get the probability that at least one of the TV sets will be color we can use the following formula....

1-(the probability of choosing balck/white tv set both times)

To get that probability we have to calculate total favourable outcomes of choosing 2 black/white tv sets... which is 2c2 since we are calculating the number of ways to choose 2 tv sets out of 2....

... and divide it by the total number of possible outcomes... which is 8c2... since we have to choose 2 tv sets out of 8...

There may be other approaches, what approach did you use?
Show more


my approach was this:

6 color tv..prob that 1 will be color 6/8, 2 black and white 2/7
6/8*2/7



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 above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!