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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 and D, how many different four-letter code words can be formed?

 Feb 18, 2021
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If we can repeat letters more than once, there are \(4^4 = \boxed{256}\) words that can be made.

 Feb 20, 2021

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