To obtain: The number of different area codes are possible when taking the digits 2-9 for the first digit, and 0-9 for the second and third digits. To find: The number of different exchange numbers are possible. To check: Whether there are enough possible phone numbers for United States and Canada and a few islands.

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Chapter 4.4, Problem 21BSC

To determine

To obtain: The number of different area codes are possible when taking the digits 2-9 for the first digit, and 0-9 for the second and third digits.

To find: The number of different exchange numbers are possible.

To check: Whether there are enough possible phone numbers for United States and Canada and a few islands.

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