Finding the Number of Area Codes USA Today reporter Paul Wiseman described the old rules for telephone
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Finding the Number of Area Codes USA Today reporter Paul Wiseman described the old rules for telephone area codes by writing about “possible area codes with 1 or 0 in the second digit. (Excluded: codes ending in 00 or 11, for toll-free calls, emergency services, and other special uses.)” Codes beginning with 0 or 1 should also be excluded. How many different area codes were possible under these old rules?
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