अनंत गुणनफल $\prod\limits_{n = 2}^\infty {\left( {1 - \frac{1}{{{n^2}}}} \right)}$ का मान क्या है?

  • A
    $1$
  • B
    $\frac{1}{4}$
  • C
    $\frac{1}{3}$
  • D
    $\frac{1}{2}$

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$\frac{1}{1 \times 5} + \frac{1}{5 \times 9} + \frac{1}{9 \times 13} + \ldots$ $n$ पदों तक $=$

यदि $t_{n} = \frac{1}{4}(n+2)(n+3)$ जहाँ $n = 1, 2, 3, \dots$ है,तो $\frac{1}{t_{1}} + \frac{1}{t_{2}} + \frac{1}{t_{3}} + \dots + \frac{1}{t_{2003}}$ का मान ज्ञात कीजिए।

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यदि $S_n = \frac{n(n + 1)(n + 2)}{6}$ है,तो $\sum_{n = 1}^\infty \frac{1}{t_n} = $

$\sum\limits_{n = 2}^\infty {\frac{n}{{1 + {n^2}\left( {{n^2} - 2} \right)}}} $ का मान ज्ञात कीजिए।

$\sum\limits_{r = 1}^\infty {{{\tan }^{ - 1}}\left( {\frac{3}{{{r^2} - r + 9}}} \right)} $ का मान ज्ञात कीजिए।

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