${\log _7}{\log _7}\sqrt {7(\sqrt {7\sqrt 7 } )} = $
${\log _7}{\log _7}\sqrt {7(\sqrt {7\sqrt 7 } )} = $
- A
$3{\log _2}7$
- B
$1 - 3{\log _3}7$
- C
$1 - 3{\log _7}2$
- D
None of these
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