There are 8 TV sets, 6 are color and 2 are black and white. : PS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 19 Jan 2017, 12:55

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# There are 8 TV sets, 6 are color and 2 are black and white.

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Manager
Joined: 01 Nov 2005
Posts: 126
Followers: 1

Kudos [?]: 99 [0], given: 0

There are 8 TV sets, 6 are color and 2 are black and white. [#permalink]

### Show Tags

04 Sep 2006, 09:47
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

There are 8 TV sets, 6 are color and 2 are black and white. If 2 sets are selected at random, what is the probability that at least one of the 2 sets is black and white.
Senior Manager
Joined: 14 Aug 2006
Posts: 363
Followers: 1

Kudos [?]: 45 [0], given: 0

### Show Tags

04 Sep 2006, 11:40
the different combinations: 8c2 = 28
only color : 6c2 = 15

so atleast one b&w: 13;

another way is by finding the combinations of each b&w with the colors = 12 + both b&w = 13;
Current Student
Joined: 03 Aug 2006
Posts: 116
Location: Next to Google
Schools: Haas School of Business
Followers: 4

Kudos [?]: 243 [0], given: 3

### Show Tags

04 Sep 2006, 14:11
Another way of looking at it.
Probability that atleast one TV is B&W = 1 - Probability that both TV's are color.

Probability that both TV's are color = 6/8 * 5/7 = 15/28
Probability that atleast one TV is B&W = 1 - 15/28 = 13/28
CEO
Joined: 20 Nov 2005
Posts: 2911
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
Followers: 24

Kudos [?]: 273 [0], given: 0

### Show Tags

05 Sep 2006, 13:06
Prob of both color = 6/8 * 5/7 = 15/28

prob of atleast one BW = 1-15/28 = 13/28
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

Last edited by ps_dahiya on 05 Sep 2006, 13:41, edited 1 time in total.
05 Sep 2006, 13:06
Display posts from previous: Sort by

# There are 8 TV sets, 6 are color and 2 are black and white.

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.