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[" Thesum of first "n" terms of an A.P.is "3n^(2)+4n." Find the "25" th term of this A.P "],[" The sum of first "n" terms of an A.P.is "5n^(2)+3n^(2)+3n" .If its "m" th term is "168," find th "],[" the fie."a" the "20" th terms of this "A" .P."]

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