VTMO 2017 — Grade 5 — final Question 8

An, Binh, Chau all lie and each owns a blue or red stone. An: “Mine matches Binh’s”; Binh: “Mine matches Chau’s”; Chau: “Exactly two of us have red stones.” How many are true: An is blue; Binh is blue; Chau is red; An and Chau differ?