Math and Arithmetic

How many different ten digit number can be formed using the digits zero until nine excluding numbers starting with zero?

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Wiki User
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


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

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