\[ 3 \times 1^{2}+5 \times 2^{2}+7 \times 3^{2}+\ldots \] श्रेणी के \( n \) पदों का योग ज्ञात कीजिए

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\[
3 \times 1^{2}+5 \times 2^{2}+7 \times 3^{2}+\ldots
\]
श्रेणी के \( n \) पदों का योग ज्ञात कीजिए
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