AMO · 2027 · Grades 6-7 · Self-study SET 28 Question 9

Mr and Mrs Hansen and their three children sit at a circular table. In how many different ways can they sit if the parents are adjacent? The five people are distinct. Rotations count as the same arrangement; reflections count as different. In the original example below, Cases 1 and 2 are rotations of each other, while Case 3 differs.



**Input:** Choose one option.