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If set A = {1, 2, 3} and set B = {2, 3, 4}, what is A - B? (2023)

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Question: If set A = {1, 2, 3} and set B = {2, 3, 4}, what is A - B? (2023)

Options:

  1. {1}
  2. {2, 3}
  3. {3, 4}
  4. {}

Correct Answer: {1}

Exam Year: 2023

Solution: 

A - B represents the elements in A that are not in B. Thus, A - B = {1}.

If set A = {1, 2, 3} and set B = {2, 3, 4}, what is A - B? (2023)

Practice Questions

Q1
If set A = {1, 2, 3} and set B = {2, 3, 4}, what is A - B? (2023)
  1. {1}
  2. {2, 3}
  3. {3, 4}
  4. {}

Questions & Step-by-Step Solutions

If set A = {1, 2, 3} and set B = {2, 3, 4}, what is A - B? (2023)
  • Step 1: Identify the elements in set A, which are {1, 2, 3}.
  • Step 2: Identify the elements in set B, which are {2, 3, 4}.
  • Step 3: Determine which elements in set A are not in set B.
  • Step 4: Look at each element in set A: 1, 2, and 3.
  • Step 5: Check if each element in A is in B: 1 is not in B, 2 is in B, and 3 is in B.
  • Step 6: The only element in A that is not in B is 1.
  • Step 7: Therefore, A - B = {1}.
  • Set Difference – The operation A - B finds elements that are in set A but not in set B.
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