Four students — 1, 2, 3, 4 — are assigned to two projects, A and B (2 each). Student 1 and Student 2 are on different projects. Student 3 is on Project A. If Student 1 is on Project A, who is on Project B?
✓ Correct Answer: Option A
Student 1 on A, Student 3 on A → Project A = {1, 3}. Student 1 and 2 different → Student 2 on B. Student 4 on B. Project B = {2, 4}.