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

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

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Question 830824: 7, 21, 8, 72, 9, ?
Answer by JulietG(1812) (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...
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