• Reasoning Ability - Syllogisms
Question
Statements :  All dogs are animals.
                        No animal is a snake .
                        Some snakes are scorpions.

Conclusion :  I.  All dogs are snakes.
                       II. No animal is a scorpion.
  • A) if only conclusion I follows
  • B) if only conclusion II follows
  • C) if either conclusion I or conclusion II follows
  • D) if neither conclusion I nor conclusion II follows
  • E) if both conclusion I and conclusion II follow
Solution
D
All dogs are animals (A) + No animal is a snake (E) = A + E = E = No dog is a snake.
Hence conclusion I does not follow.
 
Again, No animal is a snake (E) + Some snakes are scorpions (I) = E + I = O* = Some scorpions are not animals.
Hence, conclusion II does not follow.

Hence, option D is correct.
D
All dogs are animals (A) + No animal is a snake (E) = A + E = E = No dog is a snake.
Hence conclusion I does not follow.
 
Again, No animal is a snake (E) + Some snakes are scorpions (I) = E + I = O* = Some scorpions are not animals.
Hence, conclusion II does not follow.

Hence, option D is correct.
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