यदि $k \int_{0}^{1} x \cdot f(3x) \, dx = \int_{0}^{3} t \cdot f(t) \, dt$ है,तो $k$ का मान ज्ञात कीजिए।

  • A
    $9$
  • B
    $3$
  • C
    $\frac{1}{9}$
  • D
    $\frac{1}{3}$

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