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एक समांतर श्रेणी के 8 पदों का योग 64 और 19 पदों का योग 361 है, तो उस श्रेणी के n पदों का योगफल ज्ञात कीजिये ।

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एक समांतर श्रेणी के 8 पदों का योग 64 और 19 पदों का योग 361 है, तो उस श्रेणी के n पदों का योगफल ज्ञात कीजिये ।
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Correct Answer - `n^(2)`
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