શ્રેણી $\frac{1}{2!} + \frac{1}{4!} + \frac{1}{6!} + \dots$ નો સરવાળો શું થાય?

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

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

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

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

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

સરવાળો $\sum \limits_{n=1}^{\infty} \frac{2n^2+3n+4}{(2n)!}$ કોના બરાબર છે :

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