Question detail
notation check: find the nth term of the arithmetic sequence 22, 24, 26, 28. Show your working one step at a time.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Sequences
Question
notation check: find the nth term of the arithmetic sequence 22, 24, 26, 28. Show your working one step at a time.
Answer
The final answer is 2n + 20. The common difference is 2. Start with 2n because the sequence increases by 2. When n = 1, 2n gives 2. Adjust to the first term 22 by using + 20. 2n + 20
Explanation
exam warm-up keeps the canonical answer 2n + 20 fixed before the model answer is written, so the worked solution and final answer agree.
Common mistake
Recognising sequences common mistake 1
Writing a final answer without showing the method that justifies it. This can weaken answers for: [Higher only] Include simple geometric progressions, other sequences and sequences involving surds where required..
Show the method first, then give the final answer in the required form. Apply this directly to Recognising sequences.
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