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

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

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શ્રેણી $\frac{4}{1!} + \frac{11}{2!} + \frac{22}{3!} + \frac{37}{4!} + \frac{56}{5!} + \dots$ નો સરવાળો શોધો.

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

જો $2 \sinh x = \cosh x$ હોય,તો $x =$

$\frac{1 - 2x + 3x^2}{e^x}$ ના વિસ્તરણમાં,$x^5$ નો સહગુણક શું હશે?

$\frac{1}{1!} + \frac{4}{2!} + \frac{7}{3!} + \frac{10}{4!} + \dots \infty = $

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