\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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\(\{a, b\} \cup \{b, c, d\} =\)
\(\{a, b\}\)
\(\{b, c\}\)
\(\{a, c, d\}\)
\(\{a, b, d\}\)
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