Question
Statements : All dens are cattle. Â Some cattle are cows. No cow is a horse. Conclusions:I. All dens are not horses.
II. Some cows are not cattle.
III. Some horses are cows.
In each of the questions below are given three statements followed by three conclusions numbered I, II andIII. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of given conclusions definitely does not follow logically from the given  statements disregarding commonly known facts.
Solution
All dens are cattle(A) + Some cattle are cows(I) ⇒ No conclusion. Hence conclusion I does not follow. Some cattle are cows(I) ⇒ Conversion ⇒ Some cows are cattle(I). Hence conclusion II does not follow. No cow is a horse(E) ⇒ Conversion ⇒ Some horses are not cows(O). Hence conclusion III does not follow. ALTERNATE SOLUTION: Minimal possibility: 
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