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Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusion(s) logically follow(s) from the statements.
Statements:
All doors are walls.
All walls are floors.
Conclusions:
(I) All floors are walls.
(II) Some floors are doors.

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  1. Only conclusion (I) follows.
  2. Both conclusions (I) and (II) follow.
  3. Neither conclusion (I) nor (II) follows.
  4. Only conclusion (II) follows.

Answer (Detailed Solution Below)

Option 4 : Only conclusion (II) follows.
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Detailed Solution

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The least possible venn diagram:

Conclusions:
(I) All floors are walls → False (As, All doors are walls, All walls are floors. so, it cannot true)

(II) Some floors are doors → True (As, All doors are walls, All walls are floors. so, Some floors are doors holds true).

Thus, Only conclusion (II) follows.

Hence, the correct answer is "Option 4".

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