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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?

Competition practiceSyllogism
  • AOnly II follows
  • BNeither I nor II follows
  • CEither I or II follows
  • DOnly I follows

Step-by-Step Solution

Neither 'some keys are doors' nor 'no key is a door' is definitely established, but the two together cover every possibility, so they form a complementary pair and either I or II follows.
Answer: C) Either I or II follows

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