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The maximum number that can be formed is 9999. The numbers 'count themselves', except you must remember to include 0 (0000), so we get:

9999+1 = 10000 combinations.

This can also be seen in terms of pure combinatorial mathematics as 10*10*10*10 = 104 =10000.

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Q: How many 4 digit numbers can be formed from 0-9?
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