निम्नलिखित श्रेणी का $n$ पदों तक योग ज्ञात कीजिए:
$5+55+555+\ldots$

  • A
    $\frac{5}{9}\left(\frac{10}{9}(10^n-1)-n\right)$
  • B
    $\frac{50}{81}(10^n-1)-\frac{5n}{9}$
  • C
    $\frac{5}{81}(10^n-1)-\frac{5n}{9}$
  • D
    $\frac{50}{9}(10^n-1)-\frac{5n}{81}$

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