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Mathematics, 09.08.2021 23:40 dh29229
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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