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

  • A
    $1/e$
  • B
    $e/2$
  • C
    $e$
  • D
    $2e$

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$1.5 + \frac{2.6}{1!} + \frac{3.7}{2!} + \frac{4.8}{3!} + \dots$ ની કિંમત શોધો.

શ્રેણી $\frac{2}{2 !} + \frac{2+4}{3 !} + \frac{2+4+6}{4 !} + \ldots$ નો સરવાળો કેટલો થાય?

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