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Statements: All fans are lights. Some lights are bulbs. Conclusions: I. Some fans are bulbs.
II. No fan is a bulb. Which conclusion(s) logically follow?

Competition practiceSyllogism
  • AOnly II follows
  • BEither I or II follows
  • CBoth I and II follow
  • DOnly I follows

Step-by-Step Solution

The bulbs among the lights need not be fans, so neither conclusion is certain alone. 'Some fans are bulbs' and 'No fan is a bulb' are complementary, so either one holds.
Answer: B) Either I or II follows

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