Three of these are wrong. Find the one that holds.
Read exercise and reference answers
- Questions
- Question
- Three of these conversions are invalid.
- Choices
- Item
- No S is P gives No P is S
- Correct
- Yes
- Explanation
- P was undistributed, so it cannot be distributed now.
- Item
- All S is P gives All P is S
- Explanation
- O cannot be truly converted.
- Item
- Some S is not P gives Some P is not S
- Explanation
- That flips the quality from affirmative to negative.
- Item
- All S is P gives No P is S
- Question
- Three of these statements about the four forms are false.
- Choices
- Item
- I is the particular affirmative
- Correct
- Yes
- Explanation
- A is UNIVERSAL affirmative.
- Item
- A is the particular affirmative
- Explanation
- E is UNIVERSAL negative.
- Item
- E is the particular negative
- Explanation
- O is PARTICULAR negative.
- Item
- O is the universal negative
Each trap reverses a statement that cannot be reversed. Source: Logic: Deductive and Inductive, Carveth Read (1898), public domain.