There are two letters C and D. If repetitions such as CC are permitted, how many permutations are possible?

Name: There are two letters C and D. If repetitions such as CC are permitted, how many permutations are possible?
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Question

Quizplus · Accepted Answer

Since there are 2 letters (C and D) and repetitions are allowed, for each position in a permutation, there are 2 choices. For a 2-letter permutation, the total number of permutations is 2^2 = 4.

There Are Two Letters C and D