- Either the populace (guru included) knows that green is a potential eye color, if only for one person, and then the guru can leave, or the guru can never leave.
- Also it should be clarified how many attempts a person gets at stating their own eye color. If they're permitted more than one chance, then every person besides the guru can have left by the second night. (only an idiot would guess green having only seen one person with green eyes). If the guru knows green is an option, the guru leaves on the third night.
- Perhaps, with the guru's statement, they might assume that blue is the predominant color. Everyone states blue, half the people leave. The other half state brown the next night.
- The guru's fate is unknown.
- I agree that the conditions for the question have not been framed well at all.
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