यदि $S$ श्रेणी $\tan ^{-1}\left(\frac{1}{3}\right)+\tan ^{-1}\left(\frac{1}{7}\right)+\tan ^{-1}\left(\frac{1}{13}\right)+\tan ^{-1}\left(\frac{1}{21}\right)+\ldots$ के प्रथम $10$ पदों का योग है,तो $\tan ( S )$ का मान ज्ञात कीजिए।

  • A
    $\frac{5}{11}$
  • B
    $-\frac{6}{5}$
  • C
    $\frac{10}{11}$
  • D
    $\frac{5}{6}$

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योगफल $1 \times 1! + 2 \times 2! + \ldots + 50 \times 50!$ किसके बराबर है?

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?

यदि $\left(1+\frac{3}{1}\right)\left(1+\frac{5}{4}\right)\left(1+\frac{7}{9}\right) \ldots \left(1+\frac{2n+1}{n^2}\right) = 121$ है,तो $n =$

यदि $\frac{1}{2 \times 7} + \frac{1}{7 \times 12} + \frac{1}{12 \times 17} + \frac{1}{17 \times 22} + \dots$ $10$ पदों तक $= k$ है,तो $k =$

$\sum\limits_{r = 0}^{100} {(r^2 + 4r + 4)(r + 1)!}$ का मान :-

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