Q. The king placed him in a dungeon with two doors, each guarded by a giant guard, and said: “One is the door to freedom, the other to death. One guard tells the truth, the other doesn’t. You are allowed to ask only one question from any one of these two guards; and based on the response, you may figure out which door to choose.” What is the question to be asked ?

A. One guard says truth and other lies. If we take cumulative result, we’ll always get a lie (as atleast one of them lies). So, I will ask to guard “Will the other guard say if this door is correct ?”. One of these two guys will definitely lie which makes right door is exactly opposite to the question’s answer.

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“…So, I will ask to guard “Will the other guard say if this door is correct ?”. One of these two guys will definitely lie which makes right door is exactly opposite to the question’s answer.”

The answer is still not determinable by your question. Whichever guard you ask this question, how do you know whether he’s telling the truth or not.

Yes its determinable. The guard who says lie “always lies”.

Its definite that one lies and one is honest.