Question 23
HardOriginal questionRead the statements as true, even if they conflict with commonly known facts, and decide which of the conclusions follows.
Statements: All doctors are graduates. All graduates are literate.
Conclusions: I. All doctors are literate. II. Some literate people are doctors.
Show the answer and explanation
Correct answer: C
Explanation
The two statements chain together: every doctor is a graduate, and every graduate is literate, so every doctor is literate. Conclusion I follows.
Conclusion II is the converse in its weaker 'some' form. Since all doctors are literate and doctors exist, at least some literate people are doctors.
Both conclusions follow.
Worth noting
'All A are B' does not give 'All B are A', but it does give 'Some B are A'. That asymmetry is the single most useful rule in this topic.
- Concept
- Chained universal statements and their converses
- Typical timeTypical
- 90 s
- Your timeYours
- —
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