How many three-letter “words” (strings of letters) can be formed using the 26 letters of the alphabet if repetition of letters (a) is allowed? (b) is not allowed?

How many three-letter “words” (strings of letters) can be formed using the 26 letters of the alphabet if repetition of letters (a) is allowed? (b) is not allowed?
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(a) Repetition is allowed. The letters A-Z can be used for each letter position so the maximum number of 3-letter words is 26*26*26=26^3=17576.

(b) Repetition is not allowed. The number of permutations of 3 different letters out of 26 letters is 26*25*24=15600.

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