Match List I with List II
| List – I OBVERTEND | List – II OBVERSE | ||
|---|---|---|---|
| (A) | All S is P | (I) | Some S is non-P |
| (B) | No S is P | (II) | No S is non-P |
| (C) | Some S is P | (III) | All S is non-P |
| (D) | Some S is no P | (IV) | Some S is not non-P |
Choose the correct answer from the options given below:
- AOption (a)
A - I, B - III, C - IV, D - II
- BOption (b)
A - II, B - III, C - I, D - IV
- COption (c)
A - II, B - III, C - IV, D - I
- DOption (d)
A - III, B - II, C - IV, D - I
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Correct answer
A - II, B - III, C - IV, D - I
Why this answer is correct
The correct match of the given question are -
| ORIGINAL | OBVERSE | VALID | ||
|---|---|---|---|---|
| | All S is P | | --- | | All S is P | | No S is non-P | | --- | | No S is non-P | yes |
| All S is P | ||||
| No S is non-P | ||||
| No S is P | All S is non-P | yes | ||
| | Some S is P | | --- | | Some S is P | Some S is not non-P | yes | |
| Some S is P | ||||
| Some S is not P | Some S is non-P | yes |
Hence, the correct answer is A - II, B - III, C - IV, D - I.
Additional Information
- A categorical proposition is a simple proposition containing two terms, subject(S) and predicate (P), in which the predicate is either asserted or denied of the subject.
- Every categorical proposition can be reduced to one of four logical forms, named A, E, I and O.
- The 'A' proposition, is the universal affirmative usually translated as 'All S is P'.
- In the 'E' proposition, is the universal negative is usually 'No S is P'.
- The 'I' proposition, is the particular affirmative usually translated as 'Some S are P'.
- In the 'O' proposition, is the particular negative is usually translated as 'Some S are not P'
- Obversion is the inference in which the quality of the proposition is changed and the predicate is interchanged with its complement. It is valid for all four forms. The obverse is logically equivalent to the original proposition.