回复：回复：回复：回复：经典老智力题

来源: 于 2010-01-31 18:17:57 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

The first guy guesses the color that is the mod-2 sum of all the rest. He has 50% chance of being right. The other 99 guys can deduce their own color based on observation and the previous guys' answers.