The sum of the first n terms of an arithmetic progression is n^2 + 3n. How to show that the terms of the series are in arithmetic progression? - Quora
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How to Express the nth Term of an Arithmetic Sequence as a Function of n Based on a Description of the Relationship Between Successive Terms | Algebra | Study.com
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Sum of Arithmetic Sequence Formula & Examples | What is Arithmetic Sequence? - Video & Lesson Transcript | Study.com
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