Exam-style question
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D2: Explain how to approach sequences including those given by a formula for the nth term… in an AQA A-level Mathematics question. Your answer should identify the method, the key notation and one check on the final result.
Model answer
What a good answer should say
- A strong answer begins by recognising that this is a sequences and series objective about sequences including those given by a formula for the nth term….
- The method is to identify the term rule, common difference or common ratio before summing.
- The working should name the relevant notation, show one clear operation or logical step at a time, and finish with a statement that matches the question demand.
- A useful check is to substitute, compare with the graph or verify the domain/range/interval conditions where they apply.
This answer is tied to the objective: D2 Work with sequences including those given by a formula for the nth term and those generated by a simple relation of the form x_(n+1) = f(x_n); work with increasing, decreasing and periodic sequences..
Explanation
Why this works
Use the explanation to connect the worked answer back to D2 Work with sequences including those given by a formula for the nth term and those generated by a simple relation of the form x_(n+1) = f(x_n); work with increasing, decreasing and periodic sequences..
This question is anchored to D2 because it tests method selection and reasoning for sequences including those given by a formula for the nth term…, not a disconnected routine skill. It rewards precise notation, visible working and a final conclusion that follows from the stated pure mathematics method.
Maths method check
- Topic focus: Pure Mathematics.
- Question style: exam_style.
- Reasoning demand: recall.
- Check the operation, notation, units, and final answer form against the question before moving on.
Common mistake
No common mistake is linked to this question yet.