Statements: All stones are rivers.
All rivers are cars.
Some cars are trains.
Conclusions: I. Some trains are stones.
II. Some cars are stones.
III. Some trains are rivers.
Question
Statements: All stones are rivers.
All rivers are cars.
Some cars are trains.
Conclusions: I. Some trains are stones.
II. Some cars are stones.
III. Some trains are rivers.
All stones are rivers + All rivers are cars = A+A=A = All stones are cars
Conversion is some cars are stones (I). Hence II follows
All rivers are cars + Some cars are trains = A + I = No conclusion.
Hence III and consequently I do not follow.
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