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Statements: All keys are locks. Some locks are doors. Conclusions: I. Some keys are doors.
II. Some doors are locks. Which conclusion(s) follow?

Competition practiceSyllogism
  • ANeither I nor II follows
  • BBoth I and II follow
  • COnly I follows
  • DOnly II follows

Step-by-Step Solution

'Some locks are doors' converts to 'some doors are locks' (II follows). The locks that are doors need not be keys, so 'some keys are doors' is not definite.
Answer: D) Only II follows

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