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If a parent question is answered favorably, all child questions that were configured to display only if the question was answered unfavorably are added to the total score with full points (even though such questions were technically never answered at all). In other words, it is just as if all of those child questions were included on the survey and they were all answered favorably.
If a parent question is answered unfavorably, all child questions that were configured to display only if the question was answered favorably are added to the total score with zero points. In other words, it is just as if all of those questions were included on the survey, but were answered unfavorably.