Question 27
HardOriginal questionAssume the statements are true.
Statements: Some owls are eagles. No eagle is a parrot.
Conclusions:
I. Some parrots are not owls.
II. Some owls are not parrots.
Show the answer and explanation
CorrectNot quiteAnswer B
Correct answer: B
Explanation
The owls that are eagles are not parrots, because no eagle is a parrot. So some owls are not parrots: II follows.
For I, put every parrot inside the owl circle, away from the eagles. The statements still hold and every parrot is an owl, so I is not definite.
Only II follows.
Worth noting
Some + No gives 'Some (first group) are not (third group)'. Conclusion I is the reversed Some-not, which is invalid.
- Concept
- Some + No gives Some … not; its reverse does not follow
- Typical timeTypical
- 110 s
- Your timeYours
- —
Practise this chapter →
Ten questions from Syllogisms, at your own pace.