मान लीजिए $0 < \alpha < \beta < 1$ है। तो $\lim_{n \rightarrow \infty} \sum_{k=1}^{n} \int_{1/(k+\beta)}^{1/(k+\alpha)} \frac{dx}{1+x}$ का मान ज्ञात कीजिए।

  • A
    $\log_{e} \frac{\beta}{\alpha}$
  • B
    $\log_{e} \frac{1+\beta}{1+\alpha}$
  • C
    $\log_{e} \frac{1+\alpha}{1+\beta}$
  • D
    $\infty$

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मान लीजिए $f:(0, \infty) \rightarrow \mathbb{R}$ और $F(x)=\int_0^x t f(t) d t$ है। यदि $F(x^2)=x^4+x^5$ है,तो $\sum_{r=1}^{12} f(r^2)$ का मान ज्ञात कीजिए:

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