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Question
If $${\log _x}\left( {\frac{9}{{16}}} \right) = - \frac{1}{2},$$    then x is equal to:
Options:
A .  $$ - \frac{3}{4}$$
B .  $$\frac{3}{4}$$
C .  $$\frac{{81}}{{256}}$$
D .  $$\frac{{256}}{{81}}$$
Answer: Option D

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