यदि श्रेणी $\frac{1}{5}+\frac{2}{65}+\frac{3}{325}+\frac{4}{1025}+\frac{5}{2501}+\ldots$ के प्रथम दस पदों का योग $\frac{m}{n}$ है,जहाँ $m$ और $n$ सह-अभाज्य संख्याएँ हैं,तो $m + n$ का मान ज्ञात कीजिए।

  • A
    $280$
  • B
    $277$
  • C
    $276$
  • D
    $272$

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यदि $n = 1, 2, 3, \dots$ के लिए ${t_n} = \frac{1}{4}(n + 2)(n + 3)$ है,तो $\frac{1}{t_1} + \frac{1}{t_2} + \frac{1}{t_3} + \dots + \frac{1}{t_{2003}} = $

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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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अनंत श्रेणी ${\tan ^{ - 1}}\left( {\frac{2}{{1 - {1^2} + {1^4}}}} \right) + {\tan ^{ - 1}}\left( {\frac{4}{{1 - {2^2} + {2^4}}}} \right) + {\tan ^{ - 1}}\left( {\frac{6}{{1 - {3^2} + {3^4}}}} \right) + \dots$ का योग क्या है?

$\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)} = $

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