Riddle: Which of the words doesn't belong to the group? 1. Adamawa, Kano, Niger, Sokoto, Calabar? 2. De Tian, Obudu, Hukou, Gongola, Niagara
Answer: 1. Niger - All of them are states in Nigeria except Niger which is a state, country, and a river in Africa. 2. Gongola - All of them are waterfalls except Gongola which is a river.