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Prisoners in even positions name the color of the hat of a person who stands in front of them, prisoners in uneven positions name the color of their hat (they learn it from previous answers). Assuming a random distribution of hats this method should set 75 prisoners free in average.

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Are we assuming they are given opportunity to discuss a strategy as a group, or are we just going with the best strategy for any given individual ignorant of what strategies others might be using?

I'd look for patterns in the hats in front of me e.g. black, white, black, white or to see if there was an uneven distribution e.g. lots of black hats and very few white hats.

Edit: Oops, I guess this means they do have time to plan as a group.

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Assuming the situation is explained fully to the prisoners beforehand, what is the ideal strategy?

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Your solution sounds good, Drag.