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Mathematics 11 Online
OpenStudy (anonymous):

how many different telephone area codes can be formed using the digits 0-9, if 0 is not used for the first digit

OpenStudy (anonymous):

hey sorry another one;(

OpenStudy (anonymous):

We have to make 3 independent choices. They are: 1. Choose the first digit. 2. Choose the 2nd digit. 3. Choose the 3rd digit. How many choices for the first digit?

OpenStudy (anonymous):

hint, it did not say that digits could not be used twice so the number of choices do not decrease for each digit.

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