Mathematics, 28.05.2020 21:57 tesadeshazer
(a) In a certain country telephone numbers have 9 digits. The first two digits are the area code (say, 02 for Dhaka) and are the same within a given area. The last 7 digits are the local number and cannot begin with 0. How many different telephone numbers are possible within a given area code in this country?
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(a) In a certain country telephone numbers have 9 digits. The first two digits are the area code (sa...
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