• Reasoning Ability - Syllogisms
Question

Statements:  No animal is a dog.
  Some monkeys are animals.
 All cats are dogs.

Conclusions: I. No animal is a monkey.
  II. All dogs are definitely not animals.

  • A) If only conclusion I follows
  • B) If only conclusion II follows
  • C) If either conclusion I or II follows
  • D) If neither conclusion I nor II follows
  • E) If both conclusion I and II follow
Solution
B
Some monkeys are animals (I) - conversion - Some animals are monkeys (I). Hence conclusion I does not follow. 
 
Again, No animal is a dog (E) - conversion - No dog is an animal (E). It means all dogs are definitely not animals. hence conclusion II follows.

Hence, option B is correct.
B
Some monkeys are animals (I) - conversion - Some animals are monkeys (I). Hence conclusion I does not follow. 
 
Again, No animal is a dog (E) - conversion - No dog is an animal (E). It means all dogs are definitely not animals. hence conclusion II follows.

Hence, option B is correct.
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