श्रेणी $\frac{3}{1^2} + \frac{5}{1^2 + 2^2} + \frac{7}{1^2 + 2^2 + 3^2} + ...$ के $n$ पदों का योग ज्ञात कीजिए।

  • A
    $\frac{2n}{n + 1}$
  • B
    $\frac{4n}{n + 1}$
  • C
    $\frac{6n}{n + 1}$
  • D
    $\frac{9n}{n + 1}$

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श्रेणी $\frac{3}{1^{2} \times 2^{2}}+\frac{5}{2^{2} \times 3^{2}}+\frac{7}{3^{2} \times 4^{2}}+\ldots$ के $10$ पदों का योग क्या है?

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