GATE 2023 ST – Question 4

General Aptitude · Analytical Aptitude: Logical Reasoning, Deduction and Analogy · 1 mark · Multiple choice

A duck named Donald Duck says, “All ducks always lie.” Based only on this information, which statement follows with certainty?

Donald Duck always lies.
Donald Duck always tells the truth.
Donald Duck’s statement is true.
Donald Duck’s statement is false.

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Show answer and explanation

Correct answer: (D) Donald Duck’s statement is false.

Explanation

If the statement were true, Donald, being a duck, would always lie; the statement he has just made would therefore be false, a contradiction. Thus this statement is false. One false statement does not establish that Donald always lies or always tells the truth. **D**.

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