Five men, A, B, C, D, E are wearing caps of black or white colour without each knowing the colour of his cap. It is known that a man wearing black cap always speaks the truth while the ones wearing white always tell lies. If they make the following statements, find the colour worn by each of them:
A : I see three black caps and one white cap.
B : I see four white caps
C : I see one black cap and three white caps
D : I see your four black caps. combinatorics proposedcombinatoricsknights and knaves