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Calculating the sum of the first n terms of an arithmetic sequence - YouTube
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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Question Video: Finding the Number of Terms in a Given Arithmetic Sequence given the Sum of All Terms and the Values of Its First and Last Terms | Nagwa
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The first term of an arithmetic progression is –5 and the fifth term is 7. What is the sum of the first 40 terms of this progression? - Quora
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