मान लीजिए $[ \cdot ]$ महत्तम पूर्णांक फलन है और $f(x) = \lim_{n \to \infty} \frac{1}{n^3} \sum_{k=1}^n \left[ \frac{k^2}{3^x} \right]$. तो $12 \sum_{j=1}^{\infty} f(j)$ का मान ........... है।

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $4$

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