IGCSE Maths / Sequences and series
The sum of an arithmetic series
Edexcel International GCSE Maths (4MA1), chapter 9: Sequences and series, specification point 3.1c. Part of the full course.
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An arithmetic series is an arithmetic sequence with its terms added together. The sum formula finds the total of the first n terms, so it is important to distinguish it from a rule that finds one term.