Statements: All cans are vessels.
Some vessels are jars.
All jars are containers.
Some containers are drums.
Conclusions: I. Some containers are not vessels.
II. Some vessels are cans.
III. All drums may be containers.
IV. Some vessels are drums .
Some vessels are jars (I) + All jars are containers (A) = Some vessels are containers (I). ⇒ conversion ⇒ Some containers are vessels (I). Hence, conclusion I will not follow. All cans are vessels = (A) ⇒ conversion ⇒ Some vessels are cans (I). Hence, conclusion II will follow. Some containers are drums (I) ⇒ Probable conclusion ⇒ All drums may be containers (A). Hence, conclusion III will also follow. I + A = I, I + I = No conclusion. Hence, conclusion IV will not follow. Alternate method -
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