શ્રેણી $\frac{1}{2 \cdot 3} \cdot 2 + \frac{2}{3 \cdot 4} \cdot 2^{2} + \frac{3}{4 \cdot 5} \cdot 2^{3} + \ldots$ ના $n$ પદોનો સરવાળો શોધો.

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

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જો $\sum\limits_{r=1}^\infty \frac{1}{(2r-1)^2} = \frac{\pi^2}{8}$ હોય,તો $\sum\limits_{r=1}^\infty \frac{1}{r^2} = \dots$

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શ્રેણી $\frac{1}{1-3 \cdot 1^2+1^4} + \frac{2}{1-3 \cdot 2^2+2^4} + \frac{3}{1-3 \cdot 3^2+3^4} + \ldots$ ના $10$ પદોનો સરવાળો કેટલો થાય?

$\sum_{k=1}^5 \frac{1^3+2^3+\ldots+k^3}{1+3+5+\ldots+(2 k-1)}$ ની કિંમત શોધો. ($.5$ માં)

$\sum\limits_{n = 0}^\infty {\frac{{{{(n + 1)}^2}}}{{{7^n}}}}$ નું મૂલ્ય શું છે?

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