Mathematics, 03.10.2019 07:30, mackdoolittle1

Using the letters a and b, the following two-letter code words can be formed: aa, ab, bb, ba. using the letters a, b, and c, how many different three-letter code words can be formed?
i know that the answer is 27 from the answer sheet, but how? can you list the combinations? !

Answers: 1

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Using the letters a and b, the following two-letter code words can be formed: aa, ab, bb, ba. using...