આપેલ છે કે $\lim _{n \rightarrow \infty} \frac{1}{n} \sum_{r=1}^{n p} f\left(\frac{r}{n}\right)=\int_0^p f(x) d x$. જો $f: R \rightarrow R$ એ $f(x)=x^2+2$ દ્વારા વ્યાખ્યાયિત હોય,તો $\lim _{n \rightarrow \infty} \frac{3}{n}\left[f\left(\frac{7}{n}\right)+f\left(\frac{14}{n}\right)+f\left(\frac{21}{n}\right)+\ldots+f(7)\right]=$

  • A
    $55$
  • B
    $57$
  • C
    $104$
  • D
    $7$

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