श्रेणी $1 + \frac{1}{5} + \frac{1 \times 3}{5 \times 10} + \frac{1 \times 3 \times 5}{5 \times 10 \times 15} + \dots$ का योग किसके बराबर है?

  • A
    $\frac{1}{\sqrt{5}}$
  • B
    $\frac{1}{\sqrt{2}}$
  • C
    $\sqrt{\frac{5}{3}}$
  • D
    $\sqrt{5}$

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