Statements: Some mobiles are phones. All phones are chargers. Conclusions: I. Some mobiles are chargers. II. All chargers are phones. III. Some phones are mobiles.
Correct answer: A. I and III
- A. I and III
- B. Only III
- C. I and II
- D. Only I
Explanation
The correct answer is Option A: I and III. Conclusion I follows because if some mobiles are phones and all phones are chargers, then it logically extends that some mobiles must also be chargers. Conclusion III follows directly from the statement 'some mobiles are phones,' implying that some phones are indeed mobiles. Conclusion II does not follow because the statement only tells us that all phones are chargers, not that all chargers are phones. Therefore, the reverse cannot be concluded. Hence, Options B, C, and D are incorrect because they fail to account for either one or both of the conclusions that logically follow from the given statements.
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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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