Statement:
Some rivers are hills.
All hills are mountains.
No mountain is a tree.
Some trees are branches.
Conclusion:
Some rivers are not trees.
Some mountains are not branches.
No tree is a hill.
Some mountains are branches.
Some rivers are hills (I) + All hills are mountains (A) → Some rivers are mountains (I) + No mountain is a tree (E) → Some rivers are not tree (O). Hence, only I will follow. No mountain is a tree (E) + Some trees are branches (I) → Some braches are not mountains (O). Hence, conclusion II and IV do not follow but it will make a complementary pair. All hills are mountains (A) + No mountain is a tree (E) → No hill is a tree (E). Hence, conclusion III follow.
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