Redemption Questions are designed to allow students to re-attempt at questions which were previously marked as incorrect. Every live quiz includes at least 1 redemption question which appears at the end. Redemption questions also have the same scoring format (600 points or the manual score predetermined per question).
By default, Redemption Questions are enabled when you host a live quiz. You can disable them from the Advanced Settings list.
Redemption Questions usually depend on the length of a quiz. A quiz that has more than 15 questions would have multiple redemption questions either in the end or the middle of a quiz.