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anonymous
 5 years ago
There are 680 threedigit numbers that are available for use as area codes in North America. As of April 2010, 301 of them were actually being used (Source: www.nanpa.com).
a. How many additional threedigit codes are available for use?
b. Within a given area code, how many unique telephone numbers are theoretically possible?
c. As of April 2010, how many total phone numbers are possible in North America?
anonymous
 5 years ago
There are 680 threedigit numbers that are available for use as area codes in North America. As of April 2010, 301 of them were actually being used (Source: www.nanpa.com). a. How many additional threedigit codes are available for use? b. Within a given area code, how many unique telephone numbers are theoretically possible? c. As of April 2010, how many total phone numbers are possible in North America?

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