For years, telephone area codes in the United States and Canada consisted of a sequence of three
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For years, telephone area codes in the United States and Canada consisted of a sequence of three digits. The first digit was an integer between 2 and 9, the second digit was either 0 or 1, and the third digit was any integer from 1 to 9. How many area codes were possible? How many area codes starting with a 4 were possible?
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There were possible 720 area codes in total and 240 area codes s...View the full answer
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