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Mathematics, 31.07.2019 13:20 fdasbiad
In a certain country telephone numbers have 9 digits. the first two digits are the area code and are the same within a given area. the last 7 digits are the local number and cannot begin with a zero. how many different telephone numbers are possible within a given area code in this country?
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In a certain country telephone numbers have 9 digits. the first two digits are the area code and are...
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