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[" Given sum of the first n terms of an A.P.is "2n+3n^(2)" .Anchence "],[" A.P is formed with the same first term and double of the "],[" common difference,the sam of "n" terms of the new A.P.is: "],[qquad " (Online April "22,2013" ) "],[n+4n^(2)" (b) "6n^(2)-n]

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