Jon has 8 blue marbles and 4 red marble sin a bag. he took 1 marble from the bag na fthen a second marble without replacing the first one. assuming a red marble was selected first, what is the probability that jon selected a red marble both times


Since there are 12 marbles in total, he takes only one of them.  4/12, and he gets a red one.  If he doesn't replace the first one, the next one would be 3/11. The probability that Jon selected a red marble both times is 1/11. (I kind of forgot this lesson, but here's my guess.

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