What is the domain of the relation 2 8 0 8 1 5 1 3 2 3?

The domain of a relation consists of all the unique input values (or first elements) from the ordered pairs. In the given relation, the pairs are (2, 8), (0, 8), (1, 5), (1, 3), and (2, 3). The unique input values are 0, 1, and 2, so the domain of the relation is {0, 1, 2}.