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All the numbers from 0 to 999 so 1000 numbers

However if you mean only using each number once the answer is about 720

* * * * *

No. The above answer refers to the number of permutations. Permutations are NOT the same as combinations as anyone who has studies any probability theory can tell you.

The number of combinations is 9C3 = 9*8*7/3*2*1 = 84

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Q: How many 3 digit combinations can be made from 1 to 9?
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