Difficulty: Medium
Correct Answer: Only I and II follow
Explanation:
Introduction / Context:
This test mixes two particular premises with one universal. We must determine which conclusions are guaranteed across all interpretations.
Given Data / Assumptions:
Concept / Approach:
Push “some” through a subset only when the element is known to be in that subset; be careful with intersections that could be disjoint.
Step-by-Step Solution:
For II: “Some cups are bottles.” This is exactly a premise; therefore it necessarily follows.For I: From “Some cups are bottles” and “All bottles are mugs,” those specific cups are also mugs. Hence there exist elements that are both Cups and Mugs: “Some mugs are cups.”For III: “Some spoons are mugs.” We know some S are C, and some (possibly different) C are B ⊆ M. But the spoon-cups might be disjoint from the cup-bottles. No forced overlap, so III does not necessarily follow.
Verification / Alternative check:
Construct a countermodel for III: let S∩C be non-bottle cups; let C∩B be separate cups. Then no spoon is a mug, falsifying III while keeping premises true.
Why Other Options Are Wrong:
Common Pitfalls:
Assuming that two “some” statements about the same middle term (cups) must intersect; they need not.
Final Answer:
Only I and II follow.
Discussion & Comments