Find the union of each of the following pairs of sets :
$A=\{1,2,3\}, B=\varnothing$
Find the union of each of the following pairs of sets :
$A=\{1,2,3\}, B=\varnothing$
$A=\{1,2,3\}, B=\varnothing$
$A \cap B=\varnothing$
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