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Answer :

The initial sets are:

[tex]\begin{gathered} X=\mleft\lbrace5,10,15\mright\rbrace \\ Y=\mleft\lbrace3,6,9,12,15\mright\rbrace \end{gathered}[/tex]

So the union between them we combinate the items:

[tex]\text{XUY}=\mleft\lbrace3,5,6,9,10,12,15\mright\rbrace[/tex]

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