PROBLEM 1

Experiment: A bag contains 4 colored balls (a blue, a red, a green and a yellow). Two balls are chosen one at a time with replacement (once the first ball is chosen, it is placed back in the bag). If the event RB represents getting a red ball (1^st) and a blue ball (2^nd),

1. Write all the possible outcomes of the experiment (6 points)
2. Find the probability that at least one blue ball was chosen (2 points)