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Assuming that zero cannot be used for the first digit then this can be selected from numbers 1 - 9 (9 choices), and the 2nd, 3rd and 4th digits from 0 - 9 (10 choices).

The total number of different ways is : 9 x 10 x 10 x 10 = 9000.

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Q: How many different ways can you write a four digit number?
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