Math

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How many 4-character license plates are possible with 2 letters from the alphabet followed by 2 digits, if repetitions are allowed? If repetitions are not allowed?
could someone please help me with the formula, I don't understand it yet

  • Math -

    would this be the answer?

    If repetition is allowed it would be
    26 * 26 * 10 * 10 = 67600

    If repetition is not allowed it would be
    26 * 25 * 10 * 9 = 58500

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