Statements: Some computers are machines. All machines are devices. Conclusions: I. Some computers are devices. II. All devices are machines. III. All machines are computers.
Correct answer: D. Only I
- A. Only I and II
- B. Only II
- C. None follow
- D. Only I
Explanation
To solve this logical deduction question, we need to evaluate each conclusion in the context of the given statements:Conclusion I: 'Some computers are devices.' This conclusion follows because if some computers are machines and all machines are devices, then it logically follows that some computers must indeed be devices.Conclusion II: 'All devices are machines.' This conclusion does not follow. The statement 'All machines are devices' does not imply that all devices are machines. There could be devices that are not machines.Conclusion III: 'All machines are computers.' This conclusion does not follow because the statements imply that only some computers are machines, not all machines are computers.Therefore, the correct answer is Only I.
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About Logical Deductions
Logical deductions require conclusions to be drawn from stated facts, conditions and relationships without adding outside information. The work includes handling all, some and none statements, necessary and sufficient conditions, ordering restrictions, true or false conclusions, and the difference between what must be true and what could be true.
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240 free Logical Deductions MCQs from Analytical and Logical Reasoning, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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