1. The problem asks which situation does NOT illustrate combination. 2. Recall that combinations are selections where order does not matter, while permutations are arrangements where order matters. 3. Analyze each option: - A: Selecting 2 songs from 10 choices is a combination because order does not matter. - B: Fixing the schedule of students taking exactly 8 subjects is a permutation because the order (schedule) matters. - C: Enumerating subsets of a set is a combination concept. - D: Identifying lines formed by connecting points is a combination since lines are defined by pairs of points regardless of order. 4. Therefore, option B does NOT illustrate combination. Final answer: B