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If license numbers consist of 3 letters followed by 3 digits, how many different licenses could be created having at least one letter or digit repeated?

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  1. Number of all possible plates

    Number of plates with unique letters AND unique digits

    The difference of N1 and N2 gives the number of plates with at least one repeated digit or letter.

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    2. 👎
    3. ℹ️
    4. 🚩

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