Mathematics, 02.09.2020 02:01, arrissa1234hinkle

Dr. Lizardo writes down a sequence of $n$ letters, where each letter is A, B, or C, and the letter A appears an even number of times. How many different sequences could Dr. Lizardo have written down?

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Dr. Lizardo writes down a sequence of $n$ letters, where each letter is A, B, or C, and the letter A...

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