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{{ printedBook.courseTrack.name }} {{ printedBook.name }} The union of two sets is all elements in the first set, the second set and the elements in both sets. $A∪B$ In a Venn diagram, it's marked by coloring the sets.

For example, if $A={1,2,3}$ and $B={3,4,5},$ the union is
$A∪B={1,2,3,4,5}.$
Note that the element $3$ is only counted for **once** as there only exist on $3$ in the whole numbers set. The union can also be expressed using the intersection and complement of sets. For example
$A∪B=(A_{C}∩B_{C})_{C}.$