Question 57

Logical Reasoning General Intelligence Easy

You are on an island with two tribes. One tribe always tells the truth, and the other tribe always lies. You meet three individuals from the island: A, B, and C. Each individual belongs to one of the tribes. You ask each of them the same question: “Is B a truth-teller?” Here are their responses:
A says, “Yes, B is a truth-teller.
B says, “No, I am not a truth-teller.
C says, “B is a liar.
Who is telling the truth?

(A) Both B and C
(B) A only
(C) C only
(D) B only
✓ Correct Answer: Option C Verified Solution

📘 Step-by-Step Solution & Detailed Explanation:


Let's analyze the given statements logically.

Given Statements:
1. A says: "Yes, B is a truth-teller."
2. B says: "No, I am not a truth-teller."
3. C says: "B is a liar."

Step 1: Understanding B's Statement
B says, "No, I am not a truth-teller."
If B were a truth-teller, this statement would be false, which contradicts the definition of a truth-teller.
Therefore, B must be a liar.

Step 2: Checking A's Statement
A says, "Yes, B is a truth-teller."
We already established that B is a liar.
Since A claims B is a truth-teller (which is false), A must be a liar.

Step 3: Checking C's Statement
C says, "B is a liar."
Since we determined that B is indeed a liar, this means C is telling the truth.

Answer:
The only truth-teller is C.
Thus, the correct answer is: C only.

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