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    Question

    In each of the questions below are given four statements followed by  four  conclusions numbered I, II and III and IV. 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.

    Statement : All hotels are rooms. All

    rooms are flats. All flats are buildings. No building is apartments. Conclusion : Some buildings may not be rooms. Some apartments are not flats. Some apartments are flats. All hotels are buildings.
    A Only I and III follow Correct Answer Incorrect Answer
    B Only II and III follow Correct Answer Incorrect Answer
    C Only I, II and III follow Correct Answer Incorrect Answer
    D Only I, II and IV follow Correct Answer Incorrect Answer

    Solution

    all rooms are flats (A) + All flats are buildings (A) →  All rooms are buildings (A) →  Conversion →  some buildings are rooms (I) →  probable conclusion →  Some buildings may not be rooms (I). Hence, Conclusion I follows. All flats are buildings (A) + No building is an apartment (E)→  No flat is an apartment (E) →  Conversion →  Some apartments are not flats (O). Hence, conclusion II follows but Conclusion III does not follow. All hotels are room (A) + All rooms are flats (A) →   All hotels are flats (A) + All flats are buildings (A) →  All hotels are buildings. Hence, Conclusion IV follows.

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