My first problem!

Logic Level 1

Peter and Paul are identical twins. One of them always lies and the other always tells the truth. I asked one of them (I don't know who I asked):

Is Paul the one who lies? \textbf{Is Paul the one who lies?}

And the reply was yes \textbf{yes}

To whom did I asked the question to?

Peter Paul

Rohit Udaiwal by Rohit Udaiwal , 20, India

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3 solutions

If the person asked was Paul \text{Paul} . He either always lies or always tells the truth. If he always lies, his answer could not be Yes \text{Yes} . If he always tells the truth, his answer could not be Yes \text{Yes} . Therefore the person asked was not Paul \text{Paul} . It must be Peter \boxed{\text{Peter}} .

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Quick and accurate!

Yuki Kuriyama - 5 years, 10 months ago
Nisha Sharma
Aug 19, 2015

question is completely inclined towards Paul's behaviour > If peter is the person who answering : either, if he is a lier he says yes to the question ("yes Paul is the one who lies ") or if he always tells truth then here answer too is yes ("yes i always tells truth and Paul lies ") .

If Paul is the one who answering : either if he is the Lier he says no to the question ("no Paul is not the one who lies ") or if he is the one who tells truth his answer is still no (" no Paul is not the one who lies ")

so every time yes is the answer of peter so, the answer giving person in the question is PETER !

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Rohit Udaiwal
Apr 4, 2015

The answer is peter.. In every condition peter (being a liar or truth teller)will reply to the question as 'YES' only.. Paul in every condition ( being a liar or truth teller) will reply to the question as a 'NO.'

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