Mathematics, 06.12.2021 09:40 msjsnell29
Area codes are the first three digits of a 10-digit telephone number. The first digit of an area code cannot be 0 or 1.
a. How many area codes can be created if digits are allowed to be repeated?
b. How many area codes can be created if digits are not allowed to be repeated?
Answers: 3
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Area codes are the first three digits of a 10-digit telephone number. The first digit of an area cod...
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