The document introduces the concept of circular permutation, which is a way to calculate the number of possible arrangements of objects placed in a circle. It provides the formula (n-1)! to calculate circular permutations of n objects. It then gives examples of applying this formula to problems involving seating people or arranging beads on a circular bracelet or necklace. Finally, it presents problems involving seating married couples around a circular table, either with spouses sitting opposite each other or with men and women alternating.