${e^{e^x}}$ ના વિસ્તરણમાં ${x^r}$ નો સહગુણક શું છે?

  • A
    $\frac{1^r}{1!} + \frac{2^r}{2!} + \frac{3^r}{3!} + \dots$
  • B
    $1 + \frac{1}{1!} + \frac{1}{2!} + \dots + \frac{1}{r!}$
  • C
    $\frac{1}{r!} \left[ \frac{1^r}{1!} + \frac{2^r}{2!} + \frac{3^r}{3!} + \dots \right]$
  • D
    $\frac{e^r}{r!}$

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${\left[ {1 + \frac{1}{{2!}} + \frac{1}{{4!}} + \dots \infty } \right]^2} - {\left[ {1 + \frac{1}{{3!}} + \frac{1}{{5!}} + \dots \infty } \right]^2} = $

$\frac{1-2x}{e^x}$ માં $x^n$ નો સહગુણક શું છે?

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

જો $y = 1 + \frac{x}{1!} + \frac{x^2}{2!} + \frac{x^3}{3!} + \dots \infty$ હોય,તો $x = $

ધારો કે $S_{n} = 1 \cdot (n-1) + 2 \cdot (n-2) + 3 \cdot (n-3) + \dots + (n-1) \cdot 1$,$n \geq 4$ માટે. સરવાળો $\sum_{n=4}^{\infty} \left( \frac{2 S_{n}}{n!} - \frac{1}{(n-2)!} \right)$ કોના બરાબર છે?

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