<PRE><B>Question 746421</B>
A box with 10 discs: 5 yellow, 3 black, 2 green. Two discs are taken randomly without replacement. What is the probability that the first disc was black given that the second disc was also black?
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# of ways to succeed: 3*2 = 6
# of possible outcomes: 10*9
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P(black | black} = 6/90 = 1/15
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Cheers,
Stan H.
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