There are 100 prisoners, numbered 1-100. The prisoners' numbers are written onto 100 cards, put randomly into 100 envelopes numbered 1-100. They can't communicate, but are invited, one by one, to open 50 envelopes. If any prisoner fails to find his number, they all get killed.
Check @kmett's response. Though I just noticed he uses the word "drawer" instead of "envelope", which is suspiciously similar to how the problem is framed in its Wikipedia article. ;)
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Nah. Just that half the time I bump into somebody at the office offering SOME puzzle vaguely of this form as a kind of cooperation/coordination game usually with some kind of layer of "now, you're 49 draws in and haven't found your number. Do you defect and use another strategy?"
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I think the answer to *that* puzzle is "37%". ;)
End of conversation
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