Logical Deduction - Section 2 (2)
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- Logical Deduction - Section 2
In each of the following questions, two statements are given followed by three or four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance from the commonly known facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.
| 9. | Statements: All aeroplanes are trains. Some trains are chairs. Conclusions: Some aeroplanes are chairs. Some chairs are aeroplanes. Some chairs are trains. Some trains are aeroplanes. |
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Answer: Option D Explanation: Since the middle term 'trains' is not distributed even once in the/premises, no definite conclusion follows. However, III is the converse of the second premise while IV is the converse of the first premise. So, both of them hold.
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Answer: Option C Explanation: Since one premise is particular and the other negative, the conclusion must be particular negative and should not contain the middle term. So, II follows. III is the converse of the first premise and thus it also holds.
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| 11. |
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Answer: Option B Explanation: Since both the premises are universal and affirmative, the conclusion must be universal affirmative and should not contain the middle term. So, it follows that 'All branches are leaves'. Thus, I follows. IV is the converse of this conclusion and so it also holds. |