6Dec19 evening Q7

0. The converse of "All cats are mammals" is

  • Option : C
  • Explanation : Conversion refers to swapping the subject with the predicate in a categorical proposition. The following chart gives the rules of conversion for the 4 types of categorical propositions:
    PropositionConverseWhether valid/true
    (A) All S are P.All P are S. Some P are S*·.No by limitation,
    (E) No S is P.No P is S.Yes
    (I) Some S are P.Some P are S.Yes
    (0) Some S are not PSome P are not SNo

    (*In traditional logic, the A proposition has a converse by limitation which is the subaltern of the invalid A-converse; i.e., the corresponding I proposition. The converse by limitation is implied by the original but is not (usually) equivalent to it.
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