मान लीजिए $S_n = \frac{1}{1^3} + \frac{1 + 2}{1^3 + 2^3} + \frac{1 + 2 + 3}{1^3 + 2^3 + 3^3} + \dots + \frac{1 + 2 + \dots + n}{1^3 + 2^3 + \dots + n^3}$ है। यदि $100 S_n = n$ है,तो $n$ का मान ज्ञात कीजिए:

  • A
    $199$
  • B
    $99$
  • C
    $200$
  • D
    $19$

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$\frac{1}{1 \times 2} + \frac{1}{2 \times 3} + \frac{1}{3 \times 4} + \dots + \frac{1}{n(n + 1)}$ का मान ज्ञात कीजिए।

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