Preliminary rule 1: The probability of an event that must necessarily happen is taken to be 1. Preliminary rule 2: The probability of an event that necessarily cannot happen is taken to be 0. From these preliminary rules, you can infer that an event that corresponds to a tautologous statement (one that is necessarily true) must have a probability of 1. By contrast, an event that corresponds to a self-contradictory statement (one that is necessarily false) must have a probability of 0. Finally, an event that corresponds to a contingent statement (a statement that is possibly true and possibly false) must have a probability that is greater than 0 but less than 1. Apply the preliminary rules of the probability calculus to the following questions to determine the probability of each event. Only one answer is correct for each question. What is the probability of the event consisting of either the San Francisco Giants winning the World Series or not winning the World Series in the same year? (O Greater than 0 but less than 1 What is the probability of the Colorado Rockies winning the World Series next year? O 1 (O Greater than 0 but less than 1 Oo What is the probability that there will be a Third World War during the twenty-first century? (O Greater than 0 but less than 1 Qo O1 What is the probability that a particular gymnast will both win an Olympic gold medal and not win an Olympic gold medal for the same event at the same Olympic Games? Oo O Greater than 0 but less than 1 O1