If it is in response options at the following page, create a constructed list as follows ...
Assume your first question is Q1 and it uses a list called Q1List.
Let's call this constructed list Q2ConList.
This constructed list will add all items selected at Q1, randomise those selected items, and then trim the list to a maximum of 3 items.
If at Q2 you want to display these items as response options, select the Q2ConList constructed list as your list.
Does that help?
If you need to display the items in the question script, there are some SSI Script functions we can use like ...
[%FormatListLabels (ListName,"BeforeText", "AfterText")%]