Statements: All ball is rat. All rat is feather. No feather is troll. Conclusions: I. Some feathers are ball. II. Some trolls are rat.

Only I follow
Only II follows
Both I and II follow
Either I or II follows

Correct answer: Only I follow

Solution

I: All ball→rat, All rat→feather → All ball is feather. By conversion: Some feather is ball ✓. II: No feather is troll (by conversion: No troll is feather). All rat is feather, so no rat is troll. 'Some trolls are rat' is false. Only I follows.

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