Saturday, 26 November 2016

I met three dragons. One always tells the truth, other one always lies and the last one alternates between lie and truth.

I met three dragons. One always tells the truth, other one always lies and the last one alternates between lie and truth.
Dragon 1: You may ask us one question, then you must guess which dragon is which
Dragon 2: He’s lying. You may get three questions
Dragon 3: Oh no. It’s definitely one question
I asked the first dragon a question
Me: What would the second dragon say if I were to ask it if the 3rd dragon had been lying when it agreed with the first one that I could ask only one question
Dragon 1: He’d say, “Yes, the 3rd dragon was lying”
Then I asked a second question addressing the three dragons…… But they remained silent.
And, I solved the puzzle in 90 sec.

So, which dragon is which?



Answer:

They did not answer second question because it was true that i can only ask one question.
So both Dragon 1 and Dragon 3 are telling the truth first time,
So possibilities are
Case1Case2
Dragon 1Speaks BothAlways speaks Truth
Dragon 2Always LieAlways Lie
Dragon 3Always speaks TruthSpeaks Both
Now for first case Dragon 1’s answer should be
Dragon 2 will say Dragon 3 is lying, but as Dragon 1 speaks truth alternatively so this time he should say Dragon 2 will say Dragon 3 is not lying.
For the second case:
As Dragon 1 always speaks truth, he will say Dragon 2 will say Dragon 3 is Lying. Thus Case 2 is correct.


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