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" (3) In an A.P.,the sum of first "n" te...

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

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(i) The sum of the first n terms of an AP is ((5n^(2))/(2) + (3n)/(2)) . Find the nth term and the 20th term of this AP. (ii) The sum of the first n terms of an AP is ((3n^(2))/(2) + (5n)/(2)). Find its nth term and the 25th term.