3. Police plan to enforce speed limits during the morning rush hour on four different routes into the city. The traps on routes A, B, C, and D are operated 40% , 30%, 20%, and 30% of the time, respectively. Biff always speeds to work, and he has probability 0.2, 0.1, 0.5, and 0.2 of using those routes. a. What is the probability that he'll get a ticket on any one morning? b. What is the probability that he'll go on any of the routes one morning without a ticket?