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There is a 36-card deck. Two cards are taken without

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There is a 36-card deck. Two cards are taken without [#permalink] New post 06 Jul 2003, 12:45
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There is a 36-card deck. Two cards are taken without repetition at random. What is the probability of having black and red cards?
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 [#permalink] New post 07 Jul 2003, 06:55
Stolyar,

I guess we need to know how many are RED and how many are BLACK cards in a deck of 36 cards. Assuming there are 18 each of them , then the probability of drawing 1R and 1B card is

18/36 X 18/35 = 9/35

'WITHOUT REPETITION' suggests that, this is a case of finding probability of DEPENDENT events.
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 [#permalink] New post 07 Jul 2003, 11:20
There are 18 red and 18 black

18/36*18/35*36C2
  [#permalink] 07 Jul 2003, 11:20
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