## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$\{a,b,c,d,e,f,g\}$
The union ($\cup$) of two sets is the set combining the elements in the two sets. Hence, the union of $\{a,b,c,d\}$ and $\{a,c,e,f,g\}$ is $\{a,b,c,d,e,f,g\} .$