16 children are sitting at a round table
Source: Germany Federal - Bundeswettbewerb Mathematik 2011, round 1, p2
April 10, 2020
combinatorics
Problem Statement
children are sitting at a round table. After the break, they sit down again on table. They find that each child is either sitting on its original [lace or in one of the two neighboring places. How many seating arrangements are possible in this way after the break?