ou have a bag of cubes that contains 15 red cubes, 13 green cubes, 5 blue cubes and 3 purple cubes

1.  You have a bag of cubes that contains 15 red cubes, 13 green cubes, 5 blue cubes and 3 purple cubes.

      NOTE:  Before each question is asked, you begin with a well-mixed jar of cubes.

a) You draw one at random, what is the probability of getting a green cube?

b) You draw one at random.  What is the probability of getting either a blue or red cube?

c) You draw two cubes without replacement. What is the probability that the second cube is red, if we know that the first cube was blue?

d) You draw two cubes without replacement.  What is the probability that both cubes were blue?

Please show all work