Statements:
No cube is a cuboid.
Some cuboids are cones.
All cones are quadrilateral.
Conclusion:
I. No cone is a cube.
II. All quadrilaterals may be cones.
III. Some cuboids are not quadrilaterals.
No cube is a cuboid(E) + Some cuboids are cones. (I) Some cones are not cubes (O*). Hence conclusion I does not follow. All cones are quadrilaterals. (A) [Probable conclusion] All quadrilaterals may be cones. (A). Hence conclusion II follows. Some cuboids are cones. (I) + All cones are quadrilaterals. (A) Some cuboids are quadrilaterals. (I). Hence conclusion III does not follow.
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