First digit can be anything from 1 to 5 (5 numbers). <em>What is the probability of getting a "1" in the first digit? It is .</em>
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Second digit can be anything from 2 to 5 (since 1 already in first digit place). <em>What is the probability of getting a "2" in the 2nd digit? It is </em>
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Third digit can be anything from 3 to 5 (since 1 and 2 already in first and second digit, respectively). <em>What is the probability of getting a "3" in the 3rd digit? It is </em>.