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Or only 012, 345, 678, 9?

012, 345, 678

Are there any other restrictions? Otherwise, I don't see how it could be anything but \(10^3\).

that is assuming the correct combination is the last 1 entered

then its 9^3 - 1 since only 9 digits

so 728 trials may be needed

minimum is 1 trial as you get it 1st go

well you gave us 9 digits 0 to 8