Logical deduction – "Anu drinks tea only when Dolly eats samosa": Select the correct pair. (i) Dolly ate samosa. (ii) Anu drank tea. (iii) Anu did not drink tea. (iv) Dolly did not eat samosa.
Verbal Reasoning
Logical Deduction
Difficulty: Easy
Choose an option
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A(i) (ii)
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B(ii) (i)
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C(iii) (ii)
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D(ii) (iv)
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ENone of these
Answer
Correct Answer: (ii) (i)
Explanation
Introduction / Context:"Only when" again signals a one-way necessity: Tea(Anu) ⇒ AteSamosa(Dolly). It does not guarantee that Dolly eating samosa makes Anu drink tea.
Given Data / Assumptions:
- If Anu drank tea, Dolly must have eaten samosa.
Concept / Approach:Thus the pair (ii) (i) is the implication with its necessary condition.
Step-by-Step Solution:
Assume (ii) is true.Conclude (i) is true by the rule.Verification / Alternative check:(i) (ii) would be an unstated converse; (ii) (iv) contradicts the rule.
Why Other Options Are Wrong:(iii) (ii) is self-contradictory.
Common Pitfalls:Mistaking necessary for sufficient conditions.
Final Answer:(ii) (i)