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Question

In each of the questions below are given four statements followed by four conclusions numbered I, II and 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 given conclusions logically follows from the given statements disregarding commonly known facts.

Statements:

No key is a lock.

All locks are doors.

All windows are doors.

All windows are walls.

Conclusions:

I. Some windows are doors.

II. Some walls are doors.

III. Some locks are walls.

IV. Some Keys are not doors.

A Only II follows Correct Answer Incorrect Answer
B Only I and II follow Correct Answer Incorrect Answer
C Only III follows Correct Answer Incorrect Answer
D Only III and IV follow Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

All windows are doors. ⇒ I.I ⇒ Some windows are doors (I). Hence Ist follows. All windows are doors. ⇒ I.I ⇒ Some doors are windows(I) + All windows are walls(A) ⇒ Some doors are walls (I) ⇒ Conversion ⇒ Some walls are doors(I). Hence II also follows. A + I = no conclusion. Hence, III doesn’t follow. E + A = O*. Hence, IV doesn’t follow .

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