Even if there were 3 white and 2 black it wouldnt matter under the assumption that the room is completly dark.when he answers the question. If the hats were white blue purple red and green. the answer would still be black because in total darkness all the hats would be black.. It is only when the light is turned back on when the hats get a different color .If the problem would have waited till after the light was turned on before he answered the question it would eliminate that option though. it only works if he answers while it is still dark.
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