यदि $f: R \rightarrow R$ इस प्रकार है कि $f(3)=16$ और $f^{\prime}(3)=4$,तो $\lim _{x \rightarrow 3} \frac{x f(3)-3 f(x)}{x-3}$ का मान ज्ञात कीजिए।

  • A
    $4$
  • B
    $6$
  • C
    $8$
  • D
    $12$

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