To find the outcomes for the event of rolling an even number less than 5 on a regular 10-sided number cube, we need to identify the even numbers on the cube (which are 2, 4, 6, 8, and 10) and then select only those that are less than 5.
The even numbers less than 5 are:
- 2
- 4
Thus, the correct set of outcomes is: {2, 4} (left brace 2 comma 4 right brace).