Statements:All jackets are collars.
All collars are shirts.
All chains are shirts.
Conclusions:I. No collar is chain.
II. Some collars are chains.
III. Some shirts are jackets.
IV. Some chains are jackets.
All collars are shirts(A) + Some shirts are chains(I) ⇒ No conclusion. Hence conclusion I and II does not follow but they will make a complementary pair. Hence either conclusion I or II follows. All jackets are collars(A) + All collars are shirts(A) ⇒ All jackets are shirt(A) ⇒ Conversion ⇒ Some shirts are jackets(I). Hence conclusion III follows. All jackets are collars(A) + All collars are shirts(A) ⇒ All jackets are shirts(A) + Some shirts are chains(I) ⇒ No conclusion. Hence conclusion IV does not follow.
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