Asked by John
Telephone numbers are made of 7 digits. Digits can be repeated but the first digit cannot be 0 or 1. How many different telephone numbers can be created?
I believe you use combination function, but I am not sure how and where.
I believe you use combination function, but I am not sure how and where.
Answers
Answered by
Steve
there are 10 digits; only 8 allowed to start, so
8*10^6
8*10^6
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