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Answer:
Case 1: If B and C are wearing same color hats, D shouts opposite color. Means if B and C are wearing WHITE color hats then D shouts BLACK.
Case 2:C observes If D is not shouting, and waits for some time, and since D is not shouting C understands that B and C(himself) are wearing different color hats, so C shouts color opposite to B's hat color.
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