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(i) The sum of the first n terms of an A...

(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.

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