"Barney has two boxes with marbles inside. Box 1 contains 6 red marbles and 3 green m

ryan1993

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"Barney has two boxes with marbles inside. Box 1 contains 6 red marbles and 3 green m

I need help with this homework problem:

Barney has two boxes with marbles inside. Box 1 contains 6 red marbles and 3 green marbles. Box 2 contains 4 red marbles and 5 green marbles. He is going to play the following game: Pick (randomly) a marble from Box 1 and put it in box 2. Then mix the marbles in box 2 and randomly pick another marble.

a)What is the probability that the second marble is red?
b)What is the probability that the second marble is green
c) If the second marble was red what is the probability that the first marble was green?

Thanks in advanced for the help!
 
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