a radio station has a contest in which contestants roll a regular 6-sided die. if he rolls a 1 or a 2, he wins $50. if he rolls a 3 or a 4, he wins $100. if he rolls a 5, he wins $1000. if he rolls a 6, he doesn't win anything. what is the probability that out of the first 5 contestants, at most 3 of them win some money?