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**Koko** It becomes clear when you simplify the problem. In the case in which there are 901 tribe members, 900 of which have brown eyes and 1 has blue eyes, the one with blue eyes sees that the other 900 do not have blue eyes, so he figures, he must have blue eyes, and he commits suicide the very next day.

In the case in which there are 902 tribe members, 900 brown-eyed, and 2 blue-eyed, the ones with blue eyes see 900 others with brown eyes and 1 with blue eyes, so they don't know that they were addressed by the foreigner, but they both don't know. And when, the following day neither of the two commits suicide, they both figure they must have blue eyes as well, otherwise the other one should and would have committed suicide, so they commit suicide themselves, at day 2.

With 3 blue-eyed tribe members, they all commit suicide on day 3, because they figure that if neither of the other two committed suicide on the first two days, there have to be at least three tribe members with blue eyes, and they can only see two of them, so they know they have to be the third and they have to commit suicide.

And by induction, with 100 blue-eyed tribe members, they all commit suicide on the 100th day, because they found out then that there are 100 blue-eyed tribe members, whereas they can only see 99 of them.

Koko