Answer
$\{a,b,c,d,e,i,o,u\}$
Work Step by Step
The union ($\cup$) of two sets is the set containing the combined elements of both sets. Hence, $\{a,e,i,o,u\}\cup\{a,b,c,d,e\}$ results to the set with elements $
\{a,b,c,d,e,i,o,u\}
.$
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