IGCSE Maths / Sequences and series
Arithmetic series problem solving revision notes
Edexcel International GCSE Maths (4MA1), chapter 9: Sequences and series, specification point 3.1c. Part of the full course.
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Arithmetic sequences can model situations where an amount increases by the same step each time. Use the term rule for one position and the sum formula for a total, including when you need to work backwards to find how many terms there are.