Elizabeth wants to use a standard number cube to do a simulation for a scenario that

involves three equal outcomes. What is one way in which she can do this?

Standard numbered cube outcomes are {1, 2, 3, 4, 5, 6}. That makes 6 outcomes, all of them with the same probability to happen. Given that the scenario involves three outcomes with the same probability, one option is to take 1 & 2, 3 & 4 and 5 & 6 as the same result.