Eduardo, Kim, Katrina, Jim, Tyrone, lan, Larry, and Sergio have all been invited to a dinner party. They arrive randomly and each person arrives at a different time a. In how many ways can they arrive? b. In how many ways can Eduardo arrive first and Sergio last? C. Find the probability that Eduardo will arrive first and Sergio last. a. (Type an integer.) b. (Type an integer.) C. (Type a fraction. Simplify your answer.)