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Did I speak to Tina or Meena?

0 votes
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Tina & Meena are twins. One of them lies while the other is truthful. I asked one of them, “Does Tina lie?” “Yes”, was the answer.
Did I speak to Tina or Meena?

posted May 12, 2014 by Kapil Kapoor

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2 Solutions

+1 vote

If Tina lied , then the reply from Tina , would be no, the reply from Meena would be yes.
If Meena lied the reply from Meena would be yes and Tina would be No
So "yes" could be an answer only from Meena

solution May 12, 2014 by Priyaa Trippayar Sahasranaman
+1 vote

if the person talks to meena and the proposition is true then teena says lie and meena says truth,if false then teena says truth and meena lies...
say:
p=meena says truth
q=teena says truth
if we take the condition that p says truth and q says falsethen (p or not q)and p==p;where meena is answer

solution May 15, 2014 by Joy Dutta



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0 votes

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Hint :
Everyone come across this thing in middle/high school or in college, but most of us ignores it wholeheartedly

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