A bag of 30 marbles contains 8 red marbles, 10 blue marbles, and 12 green marbles.
a) Suppose that you draw two marbles without replacement (that means the first one is removed before you draw the second one). What is the probability that both are green? Write as a decimal rounded to three digits.
b) Suppose you draw two marbles with replacement (that means you mix the first one back in before drawing the second one). What is the probability that you draw a red marble followed by a blue marble? Write as a decimal rounded to three places.