a Judge decided to freed Four criminals without any punishment but after solving a puzzle, as it was a minor offence.
All four of them are lined up on some steps. A wall separates the 4th person from other three.
So to summarise:-
Criminal 1 can see 2 and 3
Criminal 2 can see 3
Criminal 3 and 4 can’t see any one
All four Criminals are wearing hats, they are told that there are two white hats and two black hats. They can’t see their own hat colour and are told to shout their hat colour as soon as they get to know for certain what colour it is.
They are not allowed to turn around or move.
They are not allowed to talk to each other.
They are not allowed to take their hat off.
Who will answqer first ?
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