4MA1/1HR Jan 2022, Question 16: Sum of an Arithmetic Series
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1HR (Higher) · Calculator · 4 marks
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The question, in short
For an arithmetic progression starting at 1 with common difference 4, work out the total of the terms from the 41st up to and including the 100th.
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Solution · 4 marks
- 11 + (100 − 1) * 4 = 397
- 21 + (41 − 1) * 4 = 161
- 3100 − 41 + 1 = 60
- 460 / 2 * (161 + 397) = 16 740
Answer16 740
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