જો $S$ એ શ્રેણી $\tan ^{-1}\left(\frac{1}{3}\right)+\tan ^{-1}\left(\frac{1}{7}\right)+\tan ^{-1}\left(\frac{1}{13}\right)+\tan ^{-1}\left(\frac{1}{21}\right)+\ldots$ ના પ્રથમ $10$ પદોનો સરવાળો હોય,તો $\tan ( S )$ ની કિંમત શોધો.

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

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જો $\frac{1}{2 \times 4} + \frac{1}{4 \times 6} + \frac{1}{6 \times 8} + \dots (n \text{ પદો}) = \frac{k n}{4(n + 1)}$ હોય,તો $k$ ની કિંમત શોધો.

$\mathop {\lim }\limits_{n \to \infty } \left( \frac{1}{1 \cdot 3} + \frac{1}{3 \cdot 5} + \frac{1}{5 \cdot 7} + \dots + \frac{1}{(2n - 1)(2n + 1)} \right)$ ની કિંમત શોધો.

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