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Answered 2007-07-05 12:36:29

If you exclude numbers starting with zero then the first digit must be between 1 and 9 (i.e. 9 combinations). The remaining 9 digits can be any value between 0 and 9 (i.e. 10 combinations).

So you can have 9x109 = 9,000,000,000 combinations.

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