Question
Give an example of four different sets $A, B, C$ and $D$ such that (1) $A \cup B=\{1,2\}$ and $C \cap D=\{2,3\}$ and (2) if $B$ and $C$ are interchanged and $\cup$ and $\cap$ are interchanged, then we get the same result.
Step 1
Let $A=\{1\}$, $B=\{2\}$, $C=\{2,3\}$, and $D=\{3\}$. Show more…
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