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$5^{2}+6^{2}+7^{2}+\ldots+20^{2} =$

यदि $A = \sum_{n=1}^{\infty} \frac{1}{(3+(-1)^{n})^{n}}$ और $B = \sum_{n=1}^{\infty} \frac{(-1)^{n}}{(3+(-1)^{n})^{n}}$ है,तो $\frac{A}{B}$ का मान ज्ञात कीजिए:

श्रेणी $1^{3}+3^{3}+5^{3}+7^{3}+\ldots$ के $n$ पदों का योग क्या है?

श्रेणी $\frac{3}{1^2} + \frac{5}{1^2 + 2^2} + \frac{7}{1^2 + 2^2 + 3^2} + \dots$ के $11$ पदों का योग क्या है?

$2^2 + 4^2 + 6^2 + \dots + (2n)^2 = \dots$

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