Every archivist is a historian. Every historian checks sources. Every source-checker is methodical. No methodical person is careless. Some assistants are archivists. Every assistant is a volunteer. Which conclusion must follow?
Correct answer: B. Some volunteers are not careless.
- A. All volunteers are archivists.
- B. Some volunteers are not careless.
- C. No assistant checks sources.
- D. Every careless person is an archivist.
Explanation
Some assistants are archivists, so they are historians, source-checkers, and methodical. Methodical people are not careless, and those assistants are volunteers, so some volunteers are not careless.
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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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