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OpenStudy (anonymous):
There are 680 three-digit 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). (3 pts.) a. How many additional three-digit 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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