IBPS RRB Officer Prelims 10 Sep 2017 Paper

(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.