Respuesta :

jbmow
It doesn't exist.  Sum of 3^i as i goes from 1 to infinity is infinite.
cadecarter
The answer is 243 since the rest of the numbers follow the rule of multiplying itself by three to get the next, all you'd have to do is simply multiply 81 by 3 to get the number of 243...

Hope this helped you! Good luck!

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