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These numbers are selections from the numbers from 100 to 999. That's 9 choices for the first digit. Each time, the second digit has 9 choices (0 to 9 excluding the hundreds digit), and then the last digit has 8 choices. Total is then 9x9x8 = 648

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Q: Find the digit represented by each of the letters a b c Each letter must represent a unique digit and a cannot equal 0?
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