SOLUTION: 7, 21, 8, 72, 9, ?

Algebra ->  Sequences-and-series -> SOLUTION: 7, 21, 8, 72, 9, ?      Log On


   

Question 830824: 7, 21, 8, 72, 9, ?
Answer by JulietG(1812) About Me  (Show Source):
You can put this solution on YOUR website!
There might be another possible solution, but the one I see is:
* 3^x
.
7 * 3^1 = 21
8 * 3^2 = 72
9 * 3^3 = 243
and so on...