Banking Exams Reasoning — Question 1837

Question

Statements: All keys are locks. Some locks are doors. Conclusions: I. Some keys are doors. II. No key is a door. Which conclusion(s) follow?

  1. Only I follows
  2. Only II follows
  3. Either I or II follows
  4. Both I and II follow

Correct answer

C — Either I or II follows

Explanation (English)

The relation between keys and doors is undetermined: some keys could be doors, or none could be. Conclusions I and II are exhaustive and mutually exclusive, so they form a complementary pair. Either I or II follows.

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