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The question given below has a set of three or four statements. Each set of statements is further divided into three segments. Choose the alternative where the third segment in the statement can be logically deduced using both the preceding two, but not just from one of them.

Statement-

I. No key is door.
II. All doors are pens.
III. Some pens are houses.

Conclusion -

I. No key is house.
II. Some pens are doors.

  • A.Only I follows
  • B.Only II follows
  • C.Only III follows
  • D.Only I and II follows

Answer: B

Correct answer: Only II follows

Conclusion II is simply the converse of the second statement: if all doors are pens then certainly some pens are doors. Conclusion I asks about keys and houses, and the statements link them only through pens - a middle term that is not distributed - so nothing follows there. Only II follows.

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