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In the statements below, take the given information to be true even if it seems to differ from commonly known facts. Statements: No dog is a cat. Some cats are pets. Conclusions: I. Some pets are dogs.
II. No pet is a dog. Which conclusion(s) follow?

Competition practiceSyllogism
  • AOnly I follows
  • BBoth I and II follow
  • CEither I or II follows
  • DOnly II follows

Step-by-Step Solution

The cats that are pets cannot be dogs, but pets outside the cats could be dogs. So neither 'some pets are dogs' nor 'no pet is a dog' is certain, yet the two together cover all possibilities — they form a complementary pair, so either I or II follows.
Answer: C) Either I or II follows

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