Practice problem
What Is a Permutation?
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How many permutations of "abcabc" exist such that no two of the same letter are next to each other? For example, "cbcaba" would be valid, while "bcaacb" would not.
Practice problem
How many permutations of "abcabc" exist such that no two of the same letter are next to each other? For example, "cbcaba" would be valid, while "bcaacb" would not.