અનંત શ્રેણી $1+\frac{1}{2!}+\frac{1 \cdot 3}{4!}+\frac{1 \cdot 3 \cdot 5}{6!}+\dots$ નો સરવાળો કેટલો થાય?

  • A
    $e$
  • B
    $e^2$
  • C
    $\sqrt{e}$
  • D
    $\frac{1}{e}$

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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.

$\sum\limits_{n = 1}^\infty {\frac{{^n{C_0} + ... + ^n{C_n}}}{{^n{P_n}}}} $ ની કિંમત શોધો.

Difficult
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$\sum_{n=1}^{\infty} \frac{2n}{(2n+1)!}$ ની કિંમત શોધો.

દરેક વાસ્તવિક સંખ્યા $x$ માટે, ધારો કે $f(x) = \frac{x}{1!} + \frac{3}{2!} x^2 + \frac{7}{3!} x^3 + \frac{15}{4!} x^4 + \dots$. તો સમીકરણ $f(x) = 0$ ને

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

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