શ્રેણી $\frac{1}{1 + \sqrt{3}} + \frac{1}{\sqrt{3} + \sqrt{5}} + \frac{1}{\sqrt{5} + \sqrt{7}} + \dots$ ના $n$ પદોનો સરવાળો કેટલો થાય?

  • A
    $\sqrt{2n + 1}$
  • B
    $\frac{1}{2}\sqrt{2n + 1}$
  • C
    $\sqrt{2n + 1} - 1$
  • D
    $\frac{1}{2}(\sqrt{2n + 1} - 1)$

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

$1000 \left[ \frac{1}{1 \times 2} + \frac{1}{2 \times 3} + \frac{1}{3 \times 4} + \ldots + \frac{1}{999 \times 1000} \right]$ ની કિંમત શોધો.

$\frac{1}{3 \cdot 6} + \frac{1}{6 \cdot 9} + \frac{1}{9 \cdot 12} + \dots$ $9$ પદો સુધી $=$

શ્રેણી $\frac{1}{1} + \frac{1}{1 + 2} + \frac{1}{1 + 2 + 3} + \dots$ ના $(n + 1)$ પદ સુધીનો સરવાળો કેટલો થાય?

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