A test requires that you answer either part A or part B. Part A consists of 9 true-false questions, and part B consists of 4 multiple-choice questions with one correct answer out of four. How many different completed answer sheets are possible? x answer sheets A test requires that you answer first Part A and then either Part B or Part C. Part A consists of 4 true-false questions, Part B consists of 6 multiplechoice questions with one correct answer out of ve, and Part C consists of 3 multiple-choice questions with one correct answer out of six. How many different completed answer sheets are possible? x Telephone Numbers In the past, a local telephone number in a country consisted of a sequence of two letters followed by ve digits. Three letters were associated with each number from 2 to 9 (just as in the standard telephone layout shown in the figure) so that each telephone number corresponded to a sequence of seven digits. How many different sequences of seven digits were possible? 67600000 x seq uences Radar Detectors Radar detectors are either powered by their own battery or plug into the cigarette lighter socket. All radar detectors come in three models: nocfrills, standard, and fancy. In addition, detectors powered by their own batteries detect either radar or laser, or both, whereas the plugin types come in models that detect either radar or laser, but not both. How many different radar detectors can you buy? x cch-ccc