## Precalculus (6th Edition)

$N \cup R = \left\{0, 1, 2, 3, 4, 5, 7, 9, 11, 13\right\}$
The symbol $\cup$ represents union of sets. The union of sets N and R is the set that contains the combined elements of N and R. Thus, $N \cup R = \left\{0, 1, 2, 3, 4, 5, 7, 9, 11, 13\right\}$.