In the United States, telephone numbers consist of a three digit area code followed by a seven digit local number. Suppose neither the first digit of an area code nor the first digit of a local number can be a zero but that all other choices are acceptable.

do not use commas when you write your number for example enter 3456789 NOT 3, 456, 789

how many telephone numbers are possible?

In the United States, telephone numbers consist of a three digit area code followed by a seven digit local number. Suppose neither the first digit of an area code nor the first digit of a local number can be a zero but that all other choices are acceptable.

do not use commas when you write your number for example enter 3456789 NOT 3, 456, 789

how many telephone numbers are possible?

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