Someone claims: 'All swans are white.' What single observation would prove the claim false?
Answer and explanation
Correct answer: B. One swan that is black
- Step 1: A general claim fails if one case breaks it. Step 2. A single black swan breaks 'all swans are white'. Answer: One swan that is black. Why not the others: more white swans, a duck or an old swan do not break the claim.
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