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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Similar Questions

$\frac{2}{1!}(\log_e 2) + \frac{2^2}{2!}(\log_e 2)^2 + \frac{2^3}{3!}(\log_e 2)^3 + \dots \infty = $

જો $x=1+\frac{1}{2 \times 1 !}+\frac{1}{4 \times 2 !}+\frac{1}{8 \times 3 !}+\ldots$ અને $y=1+\frac{x^{2}}{1 !}+\frac{x^{4}}{2 !}+\frac{x^{6}}{3 !}+\ldots$ હોય, તો $\log_{e} y$ ની કિંમત શોધો.

$(1 + x + x^2)e^{-x}$ ના વિસ્તરણમાં $x^2$ નો સહગુણક શોધો.

$1 + \frac{a - b}{a} + \frac{1}{2!} \left( \frac{a - b}{a} \right)^2 + \frac{1}{3!} \left( \frac{a - b}{a} \right)^3 + \dots \infty = $

$\frac{e^2 + 1}{2e} = $

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