0
1000.
It's not 999 like some might guess because you can count 000 as a combo.
* * * * *
Not true. The combination 123 is the same as the number 312, or 321 etc. The order of the digits, in a combination does not matter.
Without repeats, there are 10C3 = 10*9*8/(3*2*1) = 120 combinations.
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