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August 1, 2014

Homework Help: math

Posted by Abbie on Tuesday, October 20, 2009 at 9:41am.

The last part of a telephone number has four digits, e.g. 7814 1487 2103 2772
The last part of the telephone number can start with any digit apart from zero. The other three digits can be any number. How many four digit numbers are there?

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