Consider the following statements:
Any researcher who directs a Phase III clinical trial must hold both a board certification in immunology and a minimum of ten years of clinical practice.
Unless a researcher has published a peer-reviewed virology study, they cannot obtain a board certification in immunology.
Most researchers with a minimum of ten years of clinical practice have never published a peer-reviewed virology study.
Dr. Aris is currently directing a Phase III clinical trial.
Based on these statements, the claim that 'Dr. Aris belongs to the majority of researchers with at least ten years of clinical practice who have never published a peer-reviewed virology study' cannot be true.
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True. The provided claim explicitly contradicts the valid deductive chain derived from the premises, meaning it genuinely cannot be true.
The statement accurately identifies that the internal claim is logically impossible. Dr. Aris directing a trial guarantees he has a board certification, which in turn guarantees he has published a virology study. The claim that he belongs to the majority who have never published this study directly contradicts this proven fact.
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Conditional Logic Chaining and Subgroup Quantifiers
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