How many 4-letter words can be made from the letters MATH if repetition of letters is allowed? repetition of letters is not allowed?
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If repetition of letters is allowed: For each of the 4 positions in the word, we can choose any of the 4 letters. So, there are 4 options for the first letter, 4 options for the second letter, 4 options for the third letter, and 4 options for the fourth Show more…
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