You can set questions to be pooled together, such that students will get one of this bundle on their assignment–this helps ensure that each student receives a personalized exam and minimize cheating.
If you would like to pool questions together, add a question as you would to an assignment, and then click on it in the assignment.
Scrolling to the bottom offers a 'question pooling' section; click the green + on the right to expand and add questions to this pool.
Clicking add will take you back to a search page to find more questions you'd like to pool with this one! On the assignment page pooled questions will appear as multiple IDs stacked for a given question line: