3 prisoners are standing in a line to get out from jail, a guard comes and putputs a hat (black or white) on the head of each prisoner, each prisoner can see only the hat of the prisoner in front of him. The prisoners are asked from the last to the first what colorcolour of hat is on their head, if 2 out of 3 answer correctly they are all free,.
howHow can they plan a strategy in advance?
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