Answer:
1000 because there are 10*10*10 ways to choose numbers
Hope this helps
1000
Explanation:
For each digit you get 10 options: 0,1,2,3,4,5,6,7,8,9.
If you are able to use three digits then you multiply the amount of digits by 3 (10x10x10)
10x10=100
100x10=100
Therefore 1000 is your answer
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