In each of the questions below four statements are given, followed by four conclusions numbered I, II. III and IV. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements
All desks are pencils.
All pencils are windows.
All windows are doors.
All doors are walls.

Conclusions
I. Some walls are windows.
II. All desks are doors.
III. Some doors are desks.
IV. Some windows are desks.

Only I, II and III follow

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Only II, III and IV follow

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Only I, III and IV follow

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Only I, II and IV follow

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None of these

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Solution

The correct option is E None of these
All desks are pencils.
All pencils are windows.
$A + A \Rightarrow A$ -type of conclusion
All desks are windows.
Conclusion IV is the converse of this conclusion.
All pencils are windows.
All windows are doors.
All pencils are doors.
All desks are windows.
All windows are doors.
All desks are doors.
This is conclusion II.
Conclusion III is the converse of this conclusion.
All windows are doors.
All doors are walls.
All windows are walls.
Conclusion I is the converse of this conclusion.

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Similar questions

In each of the questions below are given four statements followed by three conclusions numbered I, II, and III. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements
All windows are doors.
All buildings are doors.
All doors are boats.

Conclusions
I. All windows are boats.
II. All buildings are boats.
III. Some boats are doors.

Q. In each of the questions below, there are three statements followed by four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements, disregarding commonly known facts.

Statements
All doors are windows.
All houses are windows.
Some windows are soaps.

Conclusions
I. Some doors are houses.
II. Some houses are soaps.
III. Some soaps are doors.
IV. All soaps are windows.

Q. In each of the questions below are given three statements followed by two conclusions numbered I and II. You have to take the given statements to be true even if they seem to be a variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements
Some walls are windows.
Some windows are doors.
All doors are roofs.

Conclusions
I.Some doors are walls.
II. No roof is a window.

Q. In each of the questions below are given three statements followed by four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance with commonly known facts.
Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements
All pens are houses.
Some desks are houses.
All pencils are desks.

Conclusions
I. Some pencils are houses.
II. Some desks are pencils.
III. Some pencils are pens.
IV. No desk is a pencil.

Q. In each of the questions below are given three statements followed by three conclusions numbered I, II and III. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.

Statements
All windows are doors.
All buildings are doors.
All doors are boats.

Conclusions
I. All windows are boats.
II. All buildings are boats.
III. Some boats are doors.

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