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$\frac{1^3 + 2^3 + 3^3 + 4^3 + \dots + 12^3}{1^2 + 2^2 + 3^2 + 4^2 + \dots + 12^2} = $

$1 + (1 + a)x + (1 + a + a^2)x^2 + \dots \infty = \dots \, (0 < a, x < 1)$

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श्रेणी $1+3+7+13+21+\ldots$ का $n$वाँ पद $9901$ है। $n$ का मान है

श्रेणी $3.6 + 4.7 + 5.8 + \dots$ का $(n - 2)$ पदों तक योग ज्ञात कीजिए।

अनंत श्रेणी $1+\frac{5}{6}+\frac{12}{6^{2}}+\frac{22}{6^{3}}+\frac{35}{6^{4}}+\frac{51}{6^{5}}+\frac{70}{6^{6}}+\ldots$ का योग किसके बराबर है?

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