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Part BCSIR NET December 2024everything-must-stay-inside-a

Everything must stay inside a

Let A, B, and C be sets. Which of the following sets is equal to A \ (B \ C)?

  1. A.A \ B
  2. B.(A \ B) ∪ C
  3. C.A \ (B ∪ C)
  4. D.(A \ B) ∪ (A ∩ C)✓ Correct

You have the answer. Trap Analysis is why the other three were written.

Not a worked solution repeated four times — the specific reasoning error each wrong option was built to reward, and why this one tests execution slip.

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50 are analysed free — try those first.

The trap it tests

Execution slip

The idea was right. The computation was not.

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More on this topic

The chapter behind this: Elements of set theory: operations, De Morgan and difference — free to read

From The Real Line › Elements of set theory: operations, De Morgan and difference

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