Exam-style question
Try this first
What is the safest exam approach for sigma notation for sums of series?.
- A.D3: justify each step using the relevant sequences and series rule
- B.Use any familiar GCSE calculation even if it ignores sigma notation for sums of series
- C.Write only the final answer without showing the mathematical method
- D.Change the notation or restrictions to make the algebra look simpler
Model answer
What a good answer should say
- The correct answer is D3: justify each step using the relevant sequences and series rule.
- This option is best because identify the term rule, common difference or common ratio before summing, then checks that the notation, restrictions and conclusion match the AQA A-level Mathematics objective.
This answer is tied to the objective: D3 Understand and use sigma notation for sums of series..
Explanation
Why this works
Use the explanation to connect the worked answer back to D3 Understand and use sigma notation for sums of series..
D3: justify each step using the relevant sequences and series rule is the correct option. It directly supports sigma notation for sums of series by requiring the student to identify the term rule, common difference or common ratio before summing.
The other options are weaker because they hide the reasoning, ignore restrictions, or use a generic calculation that may not fit the objective.
Maths method check
- Topic focus: Pure Mathematics.
- Question style: practice.
- Reasoning demand: understanding.
- 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.