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  1. If log10 7 = a, then log10\([ \frac { 1 } { 70 }] \)is equal to:

    2. A.

    - (1 + a)
    B.

    (1 + a)-1
    C.

    \(\frac { a } { 10 }\)
    D.

    \(\frac { 1 } { 10a }\)

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    Answer : Option A

    Explanation :

           

     

         log1 \([ \frac { 1 } { 70 }] \)=  log10 1 - log10 70
      = - log10 (7 x 10)
      = - (log10 7 + log10 10)
      = - (a + 1).

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