योगफल,$\sum_{n=1}^{7} \frac{n(n+1)(2n+1)}{4}$ का मान है

  • A
    $521$
  • B
    $663$
  • C
    $504$
  • D
    $429$

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यदि श्रेणी ${\left( {1\frac{4}{7}} \right)^2} + {\left( {1\frac{5}{7}} \right)^2} + {\left( {1\frac{6}{7}} \right)^2} + {2^2} + {\left( {2\frac{1}{7}} \right)^2} + \dots$ के प्रथम $11$ पदों का योग $\frac{11}{7}\lambda$ है,तो $\lambda$ का मान ज्ञात कीजिए।

यदि $S$ श्रेणी $1 + \frac{1 + 2}{2} + \frac{1 + 2 + 3}{3} + \dots$ के $n$ पदों का योग है,तो $S = \dots$

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श्रेणी $9 - 3 + 1 - \frac{1}{3} + \dots$ का अनंत तक का योग है

श्रेणी $2 + 7 + 14 + 23 + 34 + \dots$ का $99^{th}$ पद है

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$\frac{1^{2}}{2} + \frac{1^{2}+2^{2}}{3} + \frac{1^{2}+2^{2}+3^{2}}{4} + \frac{1^{2}+2^{2}+3^{2}+4^{2}}{5} + \dots$ $8$ पदों तक $=$

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