In each of the questions below are given three statements followed by four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.
Statements: All trains are rivers. Some rivers are houses.
All houses are lakes.
Conclusions:
I. Some lakes are trains
II. Some houses are trains
III. No train is lake
IV. Some houses are rivers
We can draw many scenarios using Venn diagrams. Conclusion IV holds in every case. So, it is implied.
Irrespective of the diagram, conclusions I and III are universally complimentary ie. one of the two always has to be implied but both can't be true at the same time. Hence we use "either" and "or".
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