11th Class Mental Ability Syllogisms Question Bank Question - Syllogism

  • question_answer
    Direction: Each of the following questions contains two statements followed by two conclusions numbered I and II. You have to consider the two statements to be true, even if they seen to be at variance at the commonly known facts. You have to decide which of the given conclusions definitely follows from the given statements.
    You are to give your answer as: (a) if only I follows ; (b) if only conclusion II follows ; (c) if either I or II follows; (d) if neither I nor II follows and (e) if both I and II follow.
    Statement:  
    A. All birds are animals.
    B. Some animals are humans.
    C. All humans are mammals.
    Conclusions:
    I. Some humans are not birds.
    II. Some birds are humans.
    III. Some animals are not mammals.
    IV. All animals are mammals.

    A) Only I and III follow  

    B) Either III or IV follows

    C) Either I or II follows

    D) Either I or II and either III or IV follow

    E) None of these

    Correct Answer: D

    Solution :

    Explanation Option (d) is correct. I and II form a complementary pair and III and IV form another complementary pair.


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