If log10 7 = a, then log10 (1/70) is equal to:

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If log10 7 = a, then log10 (1/70) is equal to:

Options:

A . - (1 + a)

B . (1 + a)-1

C . a
10

D . 1
10a

Answer: Option A
Answer: (a).- (1 + a)

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