Mathematics, 21.08.2019 19:20 tinasidell1972
Assume all telephone numbers are 10 digits long, consisting of a 3-digit area code, then a 3-digit "exchange" number, followed by a 4-digit number. hovw many telephone numbers have no 0 in the area code and no 9 in the final 4-digit number?
Answers: 1
Assume all telephone numbers are 10 digits long, consisting of a 3-digit area code, then a 3-digit "...
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