Mathematics
Mathematics, 22.10.2019 10:00, jfvjhsljdl

Area codes are made up of three - digit numbers
a. if all numbers can be used for each digit, how many area codes are possible?
b. how many area codes would be possible if repetition is not allowed?

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Area codes are made up of three - digit numbers
a. if all numbers can be used for each digit,...

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