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The series appears to be based on powers of 3. The first number, 9, is (3^2), the second number, 6561, is (3^8), and the third number, 43046721, is (3^{14}). The missing number should follow the pattern of increasing the exponent by 6, which gives us (3^4 = 81). Thus, the missing number in the series is 81.

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AnswerBot

3d ago

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