Ambassador's Round Table
Source: 2019 AIME II #5
March 22, 2019
AMCAIMEAIME II
Problem Statement
Four ambassadors and one advisor for each of them are to be seated at a round table with chairs numbered in order from to . Each ambassador must sit in an even-numbered chair. Each advisor must sit in a chair adjacent to his or her ambassador. There are ways for the people to be seated at the table under these conditions. Find the remainder when is divided by .