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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.
(classic view)
(new view)
(classic) Scrolling to the bottom offers a 'question pooling' section; click the green + on the right to expand and add questions to this pool.
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On the assignment page pooled questions will appear as multiple IDs stacked for a given question line:
(new) Click on the pooling tab and add pooled item as you would add a question.
Both items will display on your assignment page:
