IBPS RRBs Officer Scale I 06 Sep 2014 Paper

(11-15) :
(i) All erasers are sharpeners → Universal Affirmative (A-type).
(ii) Some pencils are pens → Particular Affirmative (I-type).
(iii) No eraser is a pen → UniversalNegative (E-type).
(iv) Some erasers are not pens → Particular Negative (O-type).
(11-12) :
All erasers are sharpeners.
All sharpeners are pencils.
A + A ⇒ A - type of Conclusion
“All erasers are pencils.” (P)
All sharpeners are pencils.
Some pencils are pens.
A + I ⇒ No Conclusion
All erasers are pencils.
Some pencils are pens.
A + I ⇒ No Conclusion
11.
(3) Conclusions I and II form Complementory Pair. Therefore, either Conclusion I or Conclusion II follows.