Question
Some windows are not walls. Some pictures may be
roofs. Some roofs are not walls. In the given question, a set of conclusions is given. There are five options comprising of three or more statements. You need to choose the option that contains the set of statements from which the given conclusions logically follow.Solution
No wall is a roof (E) + Some roofs are windows (I) ⇒ Some windows are not walls (O*) Some pictures are walls (I) + No wall is a roof (E) ⇒ Some pictures are not roofs (O) ⇒ [Probable conclusion] ⇒ Some pictures may be roofs No wall is a roof (E) ⇒ Conversion ⇒ Some roofs are not walls (O). Hence, option 4 is correct. By elimination method - By 1, No + no = no –ve relation can be drawn between window and wall. Hence it is eliminated. By 2, no –ve relation can be drawn between wall and roof. Hence it is eliminated. By 3, All + No = no possibility case can be drawn between picture and roof. Hence it is eliminated.  Hence answer is option 4.
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