In a village, there are n people with a mark on their forehead, but a person cant see his own mark, cant talk to other people, cant see in the mirror. Each day, people who are sure they have a mark leaves the village. After how many days, can it be determined there is no one left in the village with a mark.
On Day 1,atleast one person in the village has mark on his forehead.
On Day 1,atleast one person in the village has mark on his forehead.
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