Suppose that vehicles taking a particular freeway exit can turn right (r), turn left (l), or go straight (s). consider observing the direction for each of three successive vehicles. (enter your answers in set notation. enter empty or ∅ for the empty ) list all outcomes in the event a that all three vehicles go in the same direction. a = (b) list all outcomes in the event b that all three vehicles take different directions. b = (c) list all outcomes in the event c that exactly two of the three vehicles turn right. c = (d) list all outcomes in the event d that exactly two vehicles go in the same direction. d = (e) list outcomes in d'.d' = list outcomes in c ∪ d. c ∪ d = list outcomes in c ∩ d. c ∩ d =