Start learning →

Which reversal is safe?

Exercise and reference answers

Items
  1. Item
    No S is P
    Category
    Reverses safely
  2. Item
    Some S is P
    Category
    Reverses safely
  3. Item
    All S is P
    Category
    Does not reverse
  4. Item
    Some S is not P
    Category
    Does not reverse
Categories
  1. Item
    Reverses safely
  2. Item
    Does not reverse

Explanation

Two of the four forms reverse freely, two do not. Source: Logic: Deductive and Inductive, Carveth Read (1898), public domain.
Continue learning with Quill →

Browse more AFCAT questions and exercises →