$1 + \frac{2}{5} + \frac{3}{5^2} + \frac{4}{5^3} + \dots$ શ્રેણીના $n$ પદોનો સરવાળો કેટલો થાય?

  • A
    $\frac{25}{16} - \frac{4n + 5}{16 \times 5^{n-1}}$
  • B
    $\frac{3}{4} - \frac{2n + 5}{16 \times 5^{n+1}}$
  • C
    $\frac{3}{7} - \frac{3n + 5}{16 \times 5^{n-1}}$
  • D
    $\frac{1}{2} - \frac{5n + 1}{3 \times 5^{n+2}}$

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