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Math Help - Simple permutations?

  1. #1
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    Simple permutations?

    I think it in right forum. It's in university, but title of class is Basic Statistic.

    I'm supposed to find out how many three-letter combinations i can make using the US alphabet. letters can be repeated...

    so, it's from AAA to ZZZ

    I not sure where to begin problem. answer in book: 18,278

    i though it was 26^3, but it not answer.

    thank you!
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  2. #2
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    Quote Originally Posted by berto View Post
    Find out how many three-letter combinations i can make using the US alphabet. letters can be repeated... so, it's from AAA to ZZZ

    I not sure where to begin problem. answer in book: 18,278
    i though it was 26^3
    You are correct. As posted the answer is 26^3.
    Did you post the exact wording?
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  3. #3
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    Hello, berto!

    How many three-letter combinations can be made using the US alphabet.
    Letters can be repeated.

    Answer in book: 18,278

    I agree with Plato . . . check the original wording.


    I bet it says "combinations with up to three letters".

    Then the answer is: .  26 + 26^2 + 26^3 \:=\:18,\!278

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