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19. At UNC, all the phone numbers start with 824 or 825 a. How many different phone numbers are possible? b. How many phone numbers

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19. At UNC, all the phone numbers start with 824 or 825 a. How many different phone numbers are possible? b. How many phone numbers have no repeated digits? 20. A student can choose a computer project from one of three lists. The three lists contain 27, 14, and 18 possible projects. No project is on more than one list. How many possible projects are there to choose from

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