A bag of 27 tulip bulbs contains 12 red tulip bulbs, 8 yellow tulip bulbs, and 7 purple tulip bulbs.
a) Determine the probability that two randomly selected tulip bulbs are both red?
b) Determine the probability that the first bulb selected is red and the second yellow?
c) Determine the probability that the first bulb selected is yellow and the second red?
d) Determine the probability that one bulb is red and the other yellow?