If A is taller than B, and B is taller than C, then
Correct answer: B. A is taller than C
- A. C is taller than A
- B. A is taller than C
- C. A and C are of equal height
- D. Nothing can be said
Explanation
Height comparisons are transitive, so the relationship carries through the chain from A to C. Not all relationships behave this way: being a friend of, for example, is not transitive. Checking whether a relation is transitive before chaining it is a useful habit.
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About Logical Deductions
Logical deductions require conclusions to be drawn from stated facts, conditions and relationships without adding outside information. The work includes handling all, some and none statements, necessary and sufficient conditions, ordering restrictions, true or false conclusions, and the difference between what must be true and what could be true.
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