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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 of the conclusions follow?

Competition practiceSyllogism
  • AOnly II follows
  • BBoth I and II follow
  • COnly I follows
  • DNeither I nor II follows

Step-by-Step Solution

'Some locks are doors' converts to 'some doors are locks' (II); no definite link makes any key a door, so I does not follow.
Answer: A) Only II follows

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