A bag contains equal numbers of blue and red marbles. If two of them are drawn from the bag at random, the odds against their both being red are four to one.
Instead of drawing these two marbles, however, I draw(at random) some of the marbles from the bag, and transfer them to a second bag, which I will call Bag 2. Now one marble is drawn at random from Bag 1 and a second from Bag 2.
What are the odds against their both being blue?
2006-11-06
19:17:54
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3 answers
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asked by
enigma
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