Some windows are not walls.
Some pictures may be roofs.
Some roofs are not walls.
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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