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Question
If $${\log _{10}}7 = a,$$   then $${\log _{10}}\left( {\frac{1}{{70}}} \right)$$   is equal to
Options:
A .  - (1 + a)
B .  (1 + a)-1
C .  $$\frac{a}{10}$$
D .  $$\frac{1}{10a}$$
Answer: Option A

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