SOLUTION: How many two-letter codes can be formed using the letters A, B, C, and D? Repeated letters are allowed.
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Question 1132037: How many two-letter codes can be formed using the letters A, B, C, and D? Repeated letters are allowed.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
With repeated, there are 4 ways to choose the first and 4 ways to choose the second. That means 16 possibilities.
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