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[" 3.Find the sum of first nterms of an ...

[" 3.Find the sum of first nterms of an AP whose nth term is "(5-6n)" .Hence "],[" find the sum of its first "2" terms."],[" 4.Thesum of the first "n" terms of an "AP" is "(3n^(2)+6n)" .Find the "n" the reman "],[" the "15" th term of this "AP" ."]

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