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| Math Central | Quandaries & Queries |
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Question from Shelbie: How many 3 letter combinations are possible, if you can repeat each letter? |
Hi Shelbie,
You have 26 choices for the first letter and regardless of what letter you choose you have 26 choices for the second letter. Hence there are 26 × 26 possible two letter words. You can extend each of these possible two letter words into a three letter word by adding one of 26 possible letters and hence there are 26 × 26 × 26 possible three letter words.
Penny
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