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jmc

counting and probability intermediate

Problem

The inhabitants of the island of Jumble use the standard Roman alphabet (26 letters, A through Z). Each word in their language is 3 letters, and for some reason, they insist that all words contain the letter A at least once. How many 3-letter words are possible?
Solution
There are possible words that can be formed. Of those words, have no A. Thus, our answer is .
Final answer
1951