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100 Computer Scientists Challenge

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There are 10 sets of 10 computer scientists. 9 sets of them are weight exactly the same, and you already know how much weight they should be. However, in the last set of computer scientests, all of them are 1 kg off (you have no idea they are either all 1 kg ligher or all 1 kg heavier), making the entire set of computer scientists 10 kg lighter or heavier than the other sets.

Twelve Computer Scientists Challenge

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There are 12 computer scientists, 11 of them have the exact same weight. However, the last one is either heavier or lighter than others (but you don’t know which is the case).