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4MA1/1F Jan 2021, Question 20: Set Notation

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 2 marks

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The question, in short

From ℰ = {20, 21, 22, 23, 24, 25, 26, 27, 28, 29}, with A the odd numbers and B the multiples of 3, list the members of two sets.

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Part (i) · 1 mark

List the members of A ∩ B, the numbers in both A and B.

  1. 1Identify odd numbers in E: 21, 23, 25, 27, 29
  2. 2Identify multiples of 3 in E: 21, 24, 27
  3. 3Find common elements: 21, 27

Answer21, 27

Part (ii) · 1 mark

List the members of A ∪ B, the numbers in A or B.

  1. 1Identify odd numbers in E: 21, 23, 25, 27, 29
  2. 2Identify multiples of 3 in E: 21, 24, 27
  3. 3Combine all unique elements from both sets: 21, 23, 24, 25, 27, 29

Answer21, 23, 24, 25, 27, 29

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