Use the Fundamental Counting Principle to solve Exercises 2940. In the original plan for area codes in
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Use the Fundamental Counting Principle to solve Exercises 29–40.
In the original plan for area codes in 1945, the first digit could be any number from 2 through 9, the second digit was either 0 or 1, and the third digit could be any number except 0. With this plan, how many different area codes were possible?
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