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Mridula

To add more to the above explanation:

At step-4 :

X concludes very much that Y & Z have raised their hands, only by, one of them seeing "X" 's forehead's as RED.
As in this situation, if they have seen each other's forehead only (and also if X's is White), they could have easily answered and so X is concludes his forehead colour.

Mridula Pro contributor
3Sep2009,16:41
	To add more to the above explanation: At step-4 : X concludes very much that Y & Z have raised their hands, only by, one of them seeing "X" 's forehead's as RED. As in this situation, if they have seen each other's forehead only (and also if X's is White), they could have easily answered and so X is concludes his forehead colour.