They would. The traveller has accidentally doomed them all. edit: this is based on an unfounded assumption because of the wording of the problem - they may onl

They would. The traveller has accidentally doomed them all. edit: this is based on an unfounded assumption because of the wording of the problem - they may only know they don't have blue eyes. But when I read "100 have blue eyes and 900 have brown" it makes it sound binary and I assumed that's knowledge the tribes people have as well, i.e. we have only either blue or brown eyes.