If ${\log _x}a,\;{a^{x/2}}$ and ${\log _b}x$ are in $G.P.$, then $x = $
If ${\log _x}a,\;{a^{x/2}}$ and ${\log _b}x$ are in $G.P.$, then $x = $
- A
$ - \log ({\log _b}a)$
- B
$ - {\log _a}({\log _a}b)$
- C
${\log _a}({\log _e}a) - {\log _a}({\log _e}b)$
- D
${\log _a}({\log _e}b) - {\log _a}({\log _e}a)$
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