Difficulty: Easy
Correct Answer: The inference is true.
Explanation:
Introduction / Context:
This is a straightforward two-step subset chain. We must decide whether the stated inference is a necessary consequence of the premises.
Given Data / Assumptions:
Concept / Approach:
If A ⊆ B and B ⊆ C, then A ⊆ C. Here: Professors ⊆ Learned ⊆ Gentle.
Step-by-Step Solution:
1) From “All professors are learned,” every professor is in the set Learned.2) From “All learned are gentle,” every member of Learned is in Gentle.3) Therefore every Professor is in Gentle, which is exactly the tested inference.
Verification / Alternative check:
Any Venn diagram with concentric containment Learned inside Gentle and Professors inside Learned validates the inference.
Why Other Options Are Wrong:
Common Pitfalls:
Overcomplicating a direct chain; forgetting that two universal inclusions compose into a third.
Final Answer:
The inference is true.
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