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There're 4 suspects, and one criminal is among them.
A: The criminal is B.
B: The criminal is D.
C: I'm not the criminal.
D: B is lying.
Only one is telling the truth among the 4 people.
Who is the criminal? Say the reasons also.
If somebody put the answer down, don't look at it. It would be more fun.
Way too easy.
The criminal is D. He is the only one accusing the others of lying, taking the focus off of his guilt.
D is telling the truth. C is the criminal.
There is only one telling the truth.
if A telling the truth: B is criminal, C tell a lie->C is criminal--> false
if B telling the truth: similar to A
if C telling the truth: but D tell a lie mean B telling the truth->false cause only C telling the truth
if D telling the truth-> A, B, C tell a lie (sound resonalble) -->C is criminal
They are all guilty and are all lying. They are human!
You said: "Only 1 is telling the truth among the 4 people."
It simple means: "3 people are lying."
[A: The criminal is B.]
-The statement of A can already be considered a LIE because it "lacks a self-reference".
-Hence, his true statement would be: "B is not the criminal.".
[B: The criminal is D.]
-The statement of B can also be considered a LIE because it "lacks a self-reference".
-Hence, his true statement would be: "D is not the criminal".
[C: I'm not the criminal.]
-C's statement is true because it "has a self-reference" - indicated by the pronoun "I".
-If C lied, he would have admitted that he is the criminal.
-C can't lie. He is telling the truth that "he is not the criminal".
[D: B is lying.]
-The statement of D is also a LIE because it "lacks self-reference".
I think "D" IS THE CRIMINAL because:
-D stated that "B is lying". He is the only one in the group saying that others are lying. Only A and B lied - reversing their lies would reveal that their TRUE statements accuse no one and only state other people's innocence. And, C was telling the truth.
-Furthermore, if D was lying, then the statement of B would have been true - "B: The criminal is D."
This quiz is about a contradiction.
In numerous cases, there are 2 ways to solve a problem.
First, thinking one by one.
Second, grasping the structure.
1-1 The truth
if A is telling the truth -> B is criminal -> C is telling the truth ---> 2 people are telling the
if B is telling the truth -> D is criminal -> C is telling the truth ---> false
if C is telling the truth -> D tell a lie mean B telling the truth -->false cause C is already telling the truth
if D is telling the truth-> A, B, C are telling lies -->C is criminal
1-2 The criminal
If A is the criminal ->~~~
B and D have a inconsistent relationship. So B or D is telling the truth.
C is saying that I'm not the criminal.
If C is not the criminal, C is lying. Then there are more than 2 people saying the truth. : C and B or D are saying the truth. Or C and A and B or D are saying the truth.
I've not seen the person used the second.
Finding out the second is difficult, but using it is easy and fast.
I made a mistake.
If C is not the criminal, C is lying -> If C is not the criminal, C is telling the truth
C is criminal, D is telling the truth. It´s just simple