Dragon Logic
While adventuring on an island inhabited by red-eyed and blue-eyed dragons, you come across a bridge. Unfortunately, this bridge is guarded by a dragon. This dragon wears goggles, preventing you from seeing its eyes.
It tells you "If my eyes are blue, then you may pass."
Fortunately, you spot two dragons nearby. You cannot see their faces, but decide to ask them if the bridge-guarding dragon has blue eyes. They each answer either "Yes" or "No".
Are you able to cross the bridge?
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
The only way a conditional statement like this can be false is if the first part (my eyes are blue) is true, and the second part (you may pass) is false. The dragon cannot have red eyes because if he did, then the conditional statement cannot be false, and he would not have said it in the first place. The only logically valid scenario is that the dragon does have blue eyes and that you may cross the bridge. The information regarding the other two dragons is not needed.