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If the digit 0 is allowed then the answer is 1/(10*9*8) = 1/720 = 0.0014 approx.

If 0 is disallowed, then 1/(9*8*7) = 1/504 = 0.0020 approx.

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Q: What is the probability that you will get a 3-digit combination correct if no digits in the combination can be repeated?
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