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You can use sections to balance the questions in a quiz. For example you want to set a quiz with easy, medium and hard questions and randomly select 30 questions from a pool or 90. You will want the generated quiz to have 10 easy, 10 medium and 10 hard questions. Even with a random selection of questions you can guarantee the balance by grouping the questions under 3 sections and then choosing to ask 10 questions selected randomly from each section.
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