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How many codes consisting of a letter followed by 3 digits can be made if no digit can be used more than once?

  • Math -


    This assumes the letter "O" is allowed. Often it is not, because of confusion with zero. IT also assumes case of the letters is indifferent. If case masters, then A and a will be different, so you double the number of codes available.

  • Math -

    can you tell me how you got 9 and 8?
    I get it 26 alphabets.
    10 digits.

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