# Set Union/Examples/3 Arbitrarily Chosen Sets

 $\displaystyle A_1$ $=$ $\displaystyle \set {1, 2, 3, 4}$ $\displaystyle A_2$ $=$ $\displaystyle \set {1, 2, 5}$ $\displaystyle A_3$ $=$ $\displaystyle \set {2, 4, 6, 8, 12}$
$A_1 \cup A_2 \cup A_3 = \set {1, 2, 3, 4, 5, 6, 8, 12}$