Syllogism (windows, doors, walls): Decide which conclusion(s) follow logically. Statements: S1: All the windows are doors. S2: No door is a wall. Conclusions: C1: Some windows are walls. C2: No wall is a door. Choose the correct option.
Verbal Reasoning
Syllogism
Difficulty: Easy
Choose an option
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AOnly conclusion I follows.
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BOnly conclusion II follows.
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CBoth I and II follow.
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DNeither I nor II follows.
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EBoth (1) and (2) follow
Answer
Correct Answer: Only conclusion II follows.
Explanation
Given data
- S1: Windows ⊆ Doors.
- S2: Doors ∩ Walls = ∅ (No door is a wall).
Concept / Approach From S2, the disjointness is symmetric: If no A is B, then no B is A. Also, since Windows are a subset of Doors, Windows cannot overlap with Walls.
Testing conclusions C1: “Some windows are walls” contradicts S1+S2, because any Window is a Door and no Door is a Wall. C2: “No wall is a door” is the contrapositive-symmetric form of S2, valid for disjointness statements.
Final Answer Only conclusion II follows.