#### Answer

$\{x|x\text{ is an even positive number less than 10}\}
$

#### Work Step by Step

In set-builder notation, the given set, $\{
2,4,6,8
\}$ can be described as
\begin{array}{l}\require{cancel}
\{x|x\text{ is an even positive number less than 10}\}
.\end{array}