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

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There are 8 TV sets, 6 are color and 2 are black and white. [#permalink] New post 04 Sep 2006, 09:47
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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.
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 [#permalink] New post 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;
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 [#permalink] New post 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
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 [#permalink] New post 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
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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008


Last edited by ps_dahiya on 05 Sep 2006, 13:41, edited 1 time in total.
  [#permalink] 05 Sep 2006, 13:06
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There are 8 TV sets, 6 are color and 2 are black and white.

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