Find the union of each of the following pairs of sets :
$X =\{1,3,5\} \quad Y =\{1,2,3\}$
Find the union of each of the following pairs of sets :
$X =\{1,3,5\} \quad Y =\{1,2,3\}$
$X=\{1,3,5\} Y=\{1,2,3\}$
$X \cup Y=\{1,2,3,5\}$
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