Question
Statements: All signals are mobile. Some
mobile are expensive. All expensive are rare. Conclusion: I. Some expensive are not signal. II. Some rare are mobile. III. Some signal are rare. In each question below are given some statements followed by some conclusions numbered I, II, etc are given. You have to take the given statements to be true even if they seem to be at variance with commonly known facts and then decide which of the given conclusions logically follows from the given statements, disregarding commonly known facts.Solution
All signals are mobile(A) + Some mobile are expensive(I) ⇒ No conclusion. Hence conclusion I and III does not follow. Some mobile are expensive(I) + All expensive are rare(A) ⇒ Some mobile are rare(I). Hence conclusion II follows. 
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