Question
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. In each of the questions below are given four statements followed by four conclusions. 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 logically follows from the given statements disregarding commonly known facts.Solution
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 they make a complementary pair., hence, either conclusion II or IV follows. All hills are mountains (A) + No mountain is a tree (E) ⇒ No hill is a tree (E). Hence, conclusion III follows. 
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