In Exercises 17–27, let the universe be the set $$Z^{+}$$. Let $$X = \{1, 2, 3, 4, 5\}$$ and let Y be the set of positive, even integers. In set-builder notation, $$Y = \{2n | n \in Z^{+}\}$$. In Exercises 18–27, give a mathematical notation for the set by listing the elements if the set is finite, by using set-builder notation if the set is infinite, or by using a predefined set such as $$\emptyset$$.
17. Describe $$\overline{Y}$$ in words.
