मान लीजिए $n \geq 1$ के लिए $S_n = \sum_{k=1}^n (-1)^{k-1} \cdot k^2$ है। यदि $n = 1, 2, 3, \ldots$ के लिए $S_{2n} = -n(2n+1)$ दिया गया है,तो $S_{77} =$

  • A
    $-3003$
  • B
    $3003$
  • C
    $-2926$
  • D
    $2926$

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एक श्रेणी जिसका $n^{th}$ पद $\left( \frac{n}{x} \right) + y$ है,उसके $r$ पदों का योग क्या होगा?

यदि $S_n = 1^3 + 2^3 + \ldots + n^3$ और $T_n = 1 + 2 + \ldots + n$ है,तो

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सिद्ध कीजिए कि $\frac{1 \times 2^{2}+2 \times 3^{2}+\ldots+n \times(n+1)^{2}}{1^{2} \times 2+2^{2} \times 3+\ldots+n^{2} \times(n+1)}=\frac{3 n+5}{3 n+1}$

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