It is currently 19 Mar 2018, 11:24

### 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

# Permutation

Author Message
Intern
Joined: 20 Sep 2008
Posts: 46

### Show Tags

25 Sep 2008, 14:03
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

I have this question, I didnt find the answer among the answer choices??

A shipment of 8 television sets contains 2 black-and-white sets and 6color sets. If 2
television sets are to be chosen at random from this shipment, what is the probability
that at least 1 of the 2 sets chosen will be a black-and-white set?
A. 1/7 B. ¼ C. 5/14 D. 11/28 E. 13/26

Let's calculate the probability if all are colors then
it is : total number of color combination sets / total number of combination.

The total number of color combination sets is : combination (2 out 6) = 15
The total number of comibnation sets is : combinatioon (2 out of 8) = 28

then answer is 1 - 15/28 = 13/28
SVP
Joined: 07 Nov 2007
Posts: 1765
Location: New York

### Show Tags

25 Sep 2008, 20:46
jugolo1 wrote:
I have this question, I didnt find the answer among the answer choices??

A shipment of 8 television sets contains 2 black-and-white sets and 6color sets. If 2
television sets are to be chosen at random from this shipment, what is the probability
that at least 1 of the 2 sets chosen will be a black-and-white set?
A. 1/7 B. ¼ C. 5/14 D. 11/28 E. 13/26

Let's calculate the probability if all are colors then
it is : total number of color combination sets / total number of combination.

The total number of color combination sets is : combination (2 out 6) = 15
The total number of comibnation sets is : combinatioon (2 out of 8) = 28

then answer is 1 - 15/28 = 13/28

agree with you

Ans=(2C1*6C1+2C2*6C0)/(8C2) = 13/28.
_________________

Smiling wins more friends than frowning

Manager
Joined: 07 Jul 2007
Posts: 125

### Show Tags

08 Dec 2008, 22:01
Yes it looks your answer is correct and the mentioned answer choice are not good. (They mentiond by mistake 13/26).
Re: Permutation   [#permalink] 08 Dec 2008, 22:01
Display posts from previous: Sort by

# Permutation

Moderator: chetan2u

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne 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®.