यदि $\sum_{r=1}^{n} T_{r} = \frac{(2n-1)(2n+1)(2n+3)(2n+5)}{64}$ है,तो $\lim_{n \rightarrow \infty} \sum_{r=1}^{n} \left(\frac{1}{T_{r}}\right)$ का मान ज्ञात कीजिए:

  • A
    $1$
  • B
    $0$
  • C
    $\frac{2}{3}$
  • D
    $\frac{1}{3}$

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$\sum_{k=0}^{12} \frac{1}{\sin \left((k+1) \frac{\pi}{6}+\frac{\pi}{4}\right) \sin \left(\frac{k \pi}{6}+\frac{\pi}{4}\right)} = $

श्रेणी $1 \times 2 \times 3 + 2 \times 3 \times 4 + 3 \times 4 \times 5 + \ldots$ के $n$ पदों का योग ज्ञात कीजिए।

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$\sum\limits_{k = 1}^\infty {\frac{{3{k^2} + 3k + 1}}{{{{\left( {{k^2} + k} \right)}^3}}}} $ का मान किसके बराबर है?

मान लीजिए $S_n = \frac{1}{1^3} + \frac{1 + 2}{1^3 + 2^3} + \frac{1 + 2 + 3}{1^3 + 2^3 + 3^3} + \dots + \frac{1 + 2 + \dots + n}{1^3 + 2^3 + \dots + n^3}$ है। यदि $100 S_n = n$ है,तो $n$ का मान ज्ञात कीजिए:

यदि $\frac{1}{1 \cdot 5}+\frac{1}{5 \cdot 9}+\frac{1}{9 \cdot 13}+\ldots$ के $n$ पदों का योग $= \frac{27}{109}$ है,तो $n = $

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