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9
The geometric mean of 9 and 81 is 27.0
The geometric mean of 9 and 25 is: 15.0
A geometric sequence is : a•r^n while a quadratic sequence is a• n^2 + b•n + c So the answer is no, unless we are talking about an infinite sequence of zeros which strictly speaking is both a geometric and a quadratic sequence.
5-2x3=9