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.

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:

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)