Syllogism – Universals with a negative and an unrelated particular: Statements: All benches are cots. No cot is a lamp. Some lamps are candles. Conclusions: I) Some cots are benches. II) Some candles are cots. Choose the option that states what necessarily follows.
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AOnly Conclusion I follows
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BOnly Conclusion II follows
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CEither I or II follows
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DNeither Conclusion I nor II follows
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EBoth Conclusions I and II follow
Answer
Correct Answer: Neither Conclusion I nor II follows
Explanation
Introduction / Context:This item checks two common traps: (1) reading existence from a universal statement, and (2) projecting an unrelated particular onto a set that is explicitly disjoint. Careful set reasoning avoids both errors.
Given Data / Assumptions:
- All Benches are Cots (B ⊆ C).
- No Cot is a Lamp (C ∩ L = ∅).
- Some Lamps are Candles (∃ L ∩ Candles).
- No premise asserts that Benches actually exist; there is no 'some B' clause.
Concept / Approach:Conclusion I, 'Some cots are benches', requires existence of at least one Bench. A universal premise 'All B are C' is satisfied even if B is empty; therefore we cannot infer 'Some'. Conclusion II attempts to connect Candles to Cots via Lamps, but we know C and L are disjoint, and nothing links Candles to C except through L.
Step-by-Step Solution:C1: If B = ∅, Premise 1 remains true while 'Some C are B' is false. So I does not necessarily follow.C2: From C ∩ L = ∅ and 'Some L are Candles', any element in L∩Candles is automatically not in C. Without another premise bringing Candles into C outside of L, we cannot force Candles ∩ C ≠ ∅.
Verification / Alternative check:Model: Let C be a non-empty set, B = ∅, L disjoint from C, and let some elements of L be Candles. All premises hold. Yet C1 fails (no C that is B exists) and C2 fails (Candles inside L cannot be C). Hence neither conclusion is necessary.
Why Other Options Are Wrong:
- Only I follows / Only II follows / Both follow / Either follows: each is contradicted by the countermodel where B is empty and Candles live entirely within Lamps disjoint from Cots.
Common Pitfalls:Assuming universals imply existence (they do not) and forgetting that an explicit 'No C is L' blocks any path from Lamps to Cots.
Final Answer:Neither Conclusion I nor II follows.