Re: Another logic riddle
The stranger is clearly lying, because the monks would already know if they had blue eyes by looking in a mirror, a window, or a pool of water. Also even if there were no reflective surfaces the monks surely would told the other monks that they have blue eyes unless there is a vow of silence, which you also did not specify. If neither of these things are true, then there are (answer in white) <font color="white"> 7 monks by the principle of mathematical induction. </font>
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