All cats are animals — Syllogisms Aptitude Question
All cats are animals: Statements: All cats are animals. All animals are living things. Conclusions: I. Answer and worked solution on CodeKairo.
- Topic: Syllogisms
- Section: Logical Reasoning
- Difficulty: Easy
- Time target: 45 seconds
Question
Statements:
- All cats are animals.
- All animals are living things.
Conclusions: I. All cats are living things. II. All living things are cats.
Which conclusion follows?
Options
- Only I
- Only II
- Both I and II
- Neither
Show the answer and the worked solution
Correct answer: A. Only I
Worked solution
- Cats ⊂ animals ⊂ living things, so every cat is a living thing: conclusion I follows.
- The reverse does not: living things include much more than cats. Conclusion II does not follow.
Answer: Only I.
The idea
Venn diagrams settle syllogisms. 'All A are B' draws A inside B; conclusions must hold for every valid drawing, not just the obvious one.
Shortcut. Chain the 'all' statements forward: cats → animals → living things gives I; II runs the chain backwards, and 'all A are B' never turns into 'all B are A'.
Common trap. "Both I and II" — reversing the 'all' statements; plenty of living things (trees, dogs) are not cats.