શ્રેણી $\frac{1}{\sqrt{1} + \sqrt{2}} + \frac{1}{\sqrt{2} + \sqrt{3}} + \frac{1}{\sqrt{3} + \sqrt{4}} + ... + \frac{1}{\sqrt{n^2 - 1} + \sqrt{n^2}}$ નો સરવાળો કેટલો થાય?

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

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જો $\frac{1}{\sqrt{1}+\sqrt{2}}+\frac{1}{\sqrt{2}+\sqrt{3}}+\ldots+\frac{1}{\sqrt{99}+\sqrt{100}}=m$ અને $\frac{1}{1 \cdot 2}+\frac{1}{2 \cdot 3}+\ldots+\frac{1}{99 \cdot 100}=n$ હોય,તો બિંદુ $(m, n)$ કઈ રેખા પર આવેલું છે?

જો $\frac{1}{2 \times 3 \times 4} + \frac{1}{3 \times 4 \times 5} + \frac{1}{4 \times 5 \times 6} + \dots + \frac{1}{100 \times 101 \times 102} = \frac{k}{101}$ હોય,તો $34k$ ની કિંમત $.....$ થાય.

જો સરવાળો $\frac{3}{1^2} + \frac{5}{1^2 + 2^2} + \frac{7}{1^2 + 2^2 + 3^2} + \dots$ $20$ પદો સુધી $\frac{k}{21}$ જેટલો હોય,તો $k$ ની કિંમત શોધો.

$1(1!) + 2(2!) + 3(3!) + \dots + n(n!) = \dots$

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પદાવલિ $\frac{2^2+1}{2^2-1}+\frac{3^2+1}{3^2-1}+\frac{4^2+1}{4^2-1}+\ldots+\frac{(2011)^2+1}{(2011)^2-1}$ કયા અંતરાલમાં આવેલી છે?

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