SOLUTION: how to solve this series of numbers with formula? 81,27,9, ,

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Question 452276: how to solve this series of numbers with formula?
81,27,9, ,

Answer by htmentor(1343) About Me  (Show Source):
You can put this solution on YOUR website!
This is a geometric series with common ratio = 27/81 = 1/3
So the nth term in the series can be written as
a_n+=+81%2A%281%2F3%29%5E%28n-1%29