A moderator takes a set of 8 stamps, 4 red and 4 green, known to three logicians, and affixes two to the forehead of each logician so that each logician can see all the other stamps except those two in the moderator's pocket and the two on his or her own head. He asks them in turn if they know the colors of their own stamps:
1. A: "No"
2. B: "No"
3. C: "No"
4. A: "No"
5. B: "Yes"

What are the colors of B's stamps?

(In reply to Solution by DJ)

In the current scenario, when A has 2 red stamps, C has 2 green stamps, and B has 1 red and 1 greeen stamp, wouldn't B come to know he/she had the stamps right after C declared that he/she did not know what stamps he/she had?

-Dhruv.

Posted by dhruv on 2004-08-17 06:45:10