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Intern
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Joined: 20 Sep 2008
Posts: 45

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New post 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

Kudos [?]: 13 [0], given: 0

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Joined: 07 Nov 2007
Posts: 1792

Kudos [?]: 1060 [0], given: 5

Location: New York
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New post 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.
_________________

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Smiling wins more friends than frowning

Kudos [?]: 1060 [0], given: 5

Manager
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Joined: 07 Jul 2007
Posts: 133

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New post 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).

Kudos [?]: 35 [0], given: 0

Re: Permutation   [#permalink] 08 Dec 2008, 22:01
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