(i) All alternatives are choices →Universal Affirmative (A–type). (ii) Some posts are mails→ ParticularAffirmative (I–type) (iii) No letter is circular → UniversalNegative (E–type). (iv) Some letters are not circulars→ Particular Negative (O–type). Some mails are letters. No letter is a circular. I + E ⇒ O-type of Conclusion“Some mails are not circulars”.(P) (1) Conclusion I and ConclusionII form ComplementaryPair. Therefore, either ConclusionI or Conclusion II follows.