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अनुक्रम $8, 88, 888, 8888, \ldots$ के $n$ पदों का योग ज्ञात कीजिए।

यदि $\frac{2+4+6+8+\dots+ n \text{ पदों तक}}{1+3+5+7+\dots+ n \text{ पदों तक}} = \frac{37}{36}$ है,तो $n = $

$10$ संख्याओं $7 \times 8, 10 \times 10, 13 \times 12, 16 \times 14, \ldots$ का माध्य ....... है।

$\frac{1 \times 2^2 + 2 \times 3^2 + \ldots + 100 \times 101^2}{1^2 \times 2 + 2^2 \times 3 + \ldots + 100^2 \times 101}$ का मान क्या है?

किसी भी पूर्णांक $n \geq 1$ के लिए,$\sum_{K=1}^n K(K+2) =$

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