The $G.M.$ of roots of the equation ${x^2} - 18x + 9 = 0$ is
The $G.M.$ of roots of the equation ${x^2} - 18x + 9 = 0$ is
- A
$3$
- B
$4$
- C
$2$
- D
$1$
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- [IIT 2000]
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- [KVPY 2014]
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