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Fact 1: Humans are mammals.
Fact 2: Some humans are engineers.
Fact 3: Engineers build houses.
If the above statements are facts, which of the following can be logically inferred?
I. All mammals build houses.
II. Engineers are mammals.
III. Some humans are not engineers.
- II only.
- III only.
- I, II and III.
- I only.
Correct answer: II only.
Solution
The correct option is II because it logically follows that since all humans are mammals and some humans are engineers, those engineers must also be mammals. The other statements do not logically follow from the given facts.
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