Mathematics, 15.06.2021 23:50 allenJay
How many 3-letter words can we make from the letters A, B, C, and D, if we are allowed to repeat letters, and we must use the letter A at least once? (Here, a word is an arbitrary sequence of letters.)
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How many 3-letter words can we make from the letters A, B, C, and D, if we are allowed to repeat let...
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