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?
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
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...
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
I have one of the three numbers: 1, 2, or 3 in my mind. I speak only the truth. You can ask me just one question for which I will only reply in yes or no or don’t know.
What question will you ask me so that you are able to know the number?
I have no voice, yet I speak to you;
I tell of all things in the world that people do.
I have leaves, but I am not a tree.
I have a spine and hinges, but I am not a man or a door; I have told you all, I cannot tell you more.
What am I?