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: Some tigers are goats. No goat is rat.
All dogs are rats.
Conclusions:
I. No tiger is rat
II. No dog is goat
III. Some dogs are tigers
IV. Some rats are tigers
No goat is a rat. Hence, as shown in the diagram, none of rats' subset (dogs) are goats. Hence, conclusion II is implied.
Irrespective of the diagram, conclusions I and IV 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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