यदि $f_n(x) = \log \log \log \ldots \log x$ (जहाँ $\log$ $n$ बार दोहराया गया है),तो $\int (x f_1(x) f_2(x) \ldots f_n(x))^{-1} dx$ का मान ज्ञात कीजिए।

  • A
    $f_{n+1}(x) + c$
  • B
    $\frac{f_{n+1}(x)}{n+1} + c$
  • C
    $n f_n(x) + c$
  • D
    $\frac{f_n(x)}{n} + c$

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