Mathematics, 29.12.2020 23:50 166386

How many telephone numbers are there in the 509 area code? Telephone numbers may not start with the number 0 or 1. They also must not begin with 911 or 555. Do not consider other special circumstances. 7,980,000 or 7,999,998 and how to solve.

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How many telephone numbers are there in the 509 area code? Telephone numbers may not start with the...