Mathematics, 08.07.2020 14:01 asims13
14. All phone numbers consist of a three-digit area code, a three-digit exchange, and then a four-digit number. A town uses the 587 area code and the exchange 355; for example, 587-355-1234. How many different phone numbers are possible in this town under the following
conditions?
a) At least one digit repeats in the last four digits of the phone number.
Answers: 2
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14. All phone numbers consist of a three-digit area code, a three-digit exchange, and then a four-di...
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