All doctors in the hospital attended the seminar. Dr Ahsan did not attend the seminar. Which conclusion follows?
- A. Dr Ahsan is not a doctor in that hospital
- B. Dr Ahsan was ill
- C. The seminar was not important
- D. Dr Ahsan is a doctor elsewhere
Explanation
If every doctor in the hospital attended, then anyone who did not attend cannot be a doctor in that hospital, which is a valid contrapositive. The other options add information the statements never supply, such as a reason for the absence. A conclusion must follow necessarily, not merely plausibly.
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