Posted by jake on Saturday, March 12, 2011 at 11:39am.
Prob = (6/8)(5/7) , which was your first choice
3/4 x 5/7, but that means you presume you took out a blue marble the first time. How do you know that you didn't take out a red marble, so you still have all six blue marbles when you pick the second time?
"... but that means you presume you took out a blue marble the first time"
yes, that is the case we wanted, and the 6/8 is the probability that would have happened, and one of the blue marbles has now been picked.
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