Question

    In each of the questions below are given three statements followed by three conclusions numbered I, II and III. 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 definitely does not follow logically from the given  statements disregarding commonly known facts.

    Statements : Some trains are buses.   Some buses

    are trucks. No truck is a car. Conclusions:I. Some trains are not trucks. II. Some buses are not cars. III. No car is a truck.
    A If only conclusion I does not follow. Correct Answer Incorrect Answer
    B If only conclusion II does not follow. Correct Answer Incorrect Answer
    C If only conclusion III does not follow. Correct Answer Incorrect Answer
    D If both conclusion I and II do not follow. Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Some trains are buses(I) + Some buses are trucks(I) ⇒ No conclusion. Hence conclusion I does not follow. Some buses are trucks(I) + No truck is a car(E) ⇒ Some buses are not cars(O). Hence conclusion II follows. No truck is a car(E) ⇒ Conversion ⇒ No car is a truck(E). Hence conclusion III follows. ALTERNATE SOLUTION:  Minimal possibility: 

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