if the sum of first n terms of an AP is 3n2-2n,find the AP and its 19 th term
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Refer the link for the answer similar to your query:
https://www.meritnation.com/ask-answer/question/in-an-ap-the-sum-of-the-first-n-terms-is-5n2-3n/arithmetic-progressions/1509752
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