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Question

Directions (Q:11-15): In each of the questions given below, two statements are followed by four conclusions numbered I, II, III and IV. You have to take both the statements to be true even if they seem to be at variance with the commonly known facts and then decide which of the given conclusions logically follows from the given statements, disregarding commonly known facts.

Statements:       Some doors are walls.

                        All walls are floors.

                        All floors are rooms.

                        Some rooms are windows.

Conclusions:       I. All walls are rooms.

                        II. Some rooms are doors.

                        III. Some rooms are walls.

                        IV. Some floors are doors.

  • None follows
  • Only I and II follow
  • Only II or III follows
  • Only II III and IV follow
  • All follow
Answer- E

All walls are floors + All floors are rooms = A + A = A = All walls are rooms. Hence I follow.

Some doors are walls + All walls are rooms = I + A = I = some doors are rooms

Conversion is some rooms are doors. Hence II follows.

Conversion of I gives us III.

Some doors are walls + All walls are floors = I + A = I = some doors are floors

Conversion is some floors are doors. Hence IV follows.


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