A) \[9\sqrt{2}\]
B) \[9\]
C) \[\frac{1}{81}\]
D) \[\frac{1}{77}\]
Correct Answer: C
Solution :
\[{{x}^{2}}-18x+9=0\] Let roots are\[\alpha \]and\[\beta ,\]then \[\alpha +\beta =18\] and \[\alpha \beta =9\] \[\therefore \]Geometric and mean \[=\sqrt{\alpha \beta }\] \[=\sqrt{9}\] \[=3\]
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