ILL 1985 Problem 48

In a given country, all inhabitants are knights or knaves. A knight never lies; a knave always lies. We meet three persons, $A, B$ , and $C$ . Person $A$ says, "If $C$ is a knight, $B$ is a knave." Person $C$ says, " $A$ and I are different; one is a knight and the other is a knave." Who are the knights, and who are the knaves ?