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[" 12.In an AP,the sum of first n terms ...

[" 12.In an AP,the sum of first n terms is "(3n^(2))/(2)+(13n)/(2)" Find the "25^(@)" term."],[" 13.The ninth term of an AP is equal to seven times the second term and twelth term "],[" exceends five times the third term by "2" .Find the first term and the common "],[" difference."]

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In an A.P.the sum of first n terms is ((3n)^(2))/(2)+(13n)/(2). Find the 25^(th) term.

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