are four $10 certificates ,? five $20 certificates and three $50 certificates the prize envelopes are mixed together in a bag and drawn at random.

a) use three diagram to illusrtat possible outcomes for selecting the first two prize drawn.
b)determine the probability distribution fo the number of $20 certificates in the first two prizes drawn.
c) what is the probability that exctly three of the first five prizes selected will be $10 certificates?
d) what is tthe expected number of $10 certificates among the first five prizes drawn?