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Railways PYQCBT 1 2020

RRB NTPC · Question 97

The conclusion that follows from the premises 'All horses are mammals' and No mammals are amphibians' is:

  1. Some horses are amphibians.

  2. All horses are amphibians.

  3. Every amphibian is a horse.

  4. No amphibians are horses.

Show answer & explanation

Answer: (D) No amphibians are horses.

Explanation

All horses are mammals and no mammal is an amphibian, so no horse is an amphibian – equivalently, no amphibians are horses.