4MA1/1HR Jun 2018, Question 23: 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
Find the total of all whole numbers from 1 to 1000 that are divisible by 3.
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Solution · 4 marks
- 1999 ÷ 3 = 333
- 2Number of terms = 333
- 3First term = 3, Last term = 999
- 4Sum = (333 / 2) × (3 + 999)
- 5(333 / 2) × 1002 = 166833
Answer166833
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