Posted:
@SW,
Yes,it is called relatively easy one..X is wearing White hat.How?
Z says 'Don't know' means X=Black,Y=Black combination is not there as there are only two Black hats.
Hence Possibilities are
X=White,Y=White OR
X=Black,Y=White OR
X=White,Y=Black
Now,Y says 'Don't know' means X is not wearing Black hat as if X=Black then from second possibility above,Y is sure he is wearing White hat only.
Means X is wearing White hat.
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