New SIDBI Grade A New Batch Starts on Nov 18

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    Question

    In each question below are given three statements followed by three conclusions numbered I, II and III. You have to take the two 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 three given statements, disregarding commonly known facts.

    Statements:                      

    All mammals are reptiles.

    All snakes are reptiles.

    All reptiles are amphibians.

    Conclusions:      

    I. All mammals are amphibians.

    II. All snakes are amphibians.

    III. Some amphibians are mammals.

    A None follows Correct Answer Incorrect Answer
    B Only I and II follow Correct Answer Incorrect Answer
    C Only II and III follow Correct Answer Incorrect Answer
    D All follows. Correct Answer Incorrect Answer

    Solution

    All mammals are reptiles. (A) + All reptiles are amphibians(A) = All mammals are amphibians(A). Hence, conclusion I will follow. All snakes are reptiles (A) + All reptiles are amphibians(A) =  All snakes are amphibians. Hence, conclusion II will also follow. All mammals are amphibians(A) ⇒ conversion ⇒ Some amphibians are mammal (I). Hence, conclusion III will also follow.

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