यदि $\log _{10} 7 = a$ है,तो $\log _{10} \left( \frac{1}{70} \right)$ का मान क्या होगा?

  • A
    $-(1+a)$
  • B
    $(1+a)^{-1}$
  • C
    $\frac{a}{10}$
  • D
    $\frac{1}{10a}$

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