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The counting principle works like this.
Multiply the number of choices you have for each character.
If you can have 0000000000 then you would multiply 10x10x10x10x10x10x10x10x10x10 or 10,000,000,000.
10 billion.
If you eliminate that number that there is one less.

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Q: How many ten digit telephone numbers are there?
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