Answer
$B\cup D$={1,2,3,4,5,6,7,8,9}
Work Step by Step
B={2,4,6,8}
D={1,3,5,7,9}
$B\cup D$ contains all elements in either B or D.
$B\cup D$={1,2,3,4,5,6,7,8,9}
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