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The missing number in the series 9, ____, 6561, 43046721 is:

Please help me quickly figure this out. I'm taking a test and I'm really stumped. 

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Richard P. | Fairfax County Tutor for HS Math and ScienceFairfax County Tutor for HS Math and Sci...
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Well the sequence is
 
91  92  94  98
 
So the second term is 81.