The moderator takes a set of 8 stamps, 4 red and 4 green, known to the logicians, and loosely affixes two to the forehead of each logician so that each logician can see all the other stamps except those 2 in the moderator's pocket and the two on her own head. He asks them in turn

if they know the colors of their own stamps
A: "No" B: "No" C: "No" A: "No B: "Yes" What are the colors of her stamps, and what is the situation?

Stamps Solution

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