Difficulty: Easy
Correct Answer: true
Explanation:
Introduction / Context:This is a classic categorical syllogism. If an individual item belongs to a class, and that entire class has a property, then the individual inherits that property. The question is whether the conclusion necessarily follows from the two given premises without extra assumptions.
Given Data / Assumptions:
Concept / Approach:
Step-by-Step Solution:
From Premise 1: toothpick ∈ Useful.From Premise 2: Useful ⊆ Valuable.Therefore: toothpick ∈ Valuable. The conclusion follows deductively and must be true.Verification / Alternative check:
Venn-style thinking: The “Useful” circle sits entirely within the “Valuable” circle. Since the toothpick is inside “Useful,” it must also lie inside “Valuable.”Why Other Options Are Wrong:
false: Contradicts a valid deductive inference.uncertain: There is no uncertainty; the premises are universal and sufficient.both true and false: Mutually inconsistent; the conclusion has a determinate truth value under the premises.Common Pitfalls:
Injecting real-world opinions about the value of a toothpick. Deductive questions rely solely on the stated premises, not personal beliefs.Final Answer:
true
Discussion & Comments