શ્રેણી $\frac{1^2}{1 \cdot 2!} + \frac{1^2 + 2^2}{2 \cdot 3!} + \frac{1^2 + 2^2 + 3^2}{3 \cdot 4!} + \dots + \frac{1^2 + 2^2 + \dots + n^2}{n(n + 1)!} + \dots \infty$ નો સરવાળો કેટલો થાય?

  • A
    $e^2$
  • B
    $\frac{1}{2}(e + e^{-1})^2$
  • C
    $\frac{3e - 1}{6}$
  • D
    $\frac{4e + 1}{6}$

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$\frac{2}{1!} + \frac{4}{3!} + \frac{6}{5!} + \frac{8}{7!} + \dots \infty = $

$\sum_{k=1}^{\infty} \frac{1}{k !} \left(\sum_{n=1}^k 2^{n-1}\right)$ ની કિંમત શોધો.

$\frac{2}{3!} + \frac{4}{5!} + \frac{6}{7!} + \dots \infty = $

$\frac{x^2 - y^2}{1!} + \frac{x^4 - y^4}{2!} + \frac{x^6 - y^6}{3!} + \dots \infty = $

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