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    Question

    In the question below some statements are given followed

    by three conclusions 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 the given conclusion definitely follows from the given statements, disregarding commonly known facts. Statements: Some Key are Lock. No Lock is Door. Some Door are Window. Conclusions: I. Some Key are not Window. II. Some Window are not Lock. III. No Key is Door.
    A Only conclusion II follows Correct Answer Incorrect Answer
    B Only conclusions I and II follow Correct Answer Incorrect Answer
    C All the conclusions follow Correct Answer Incorrect Answer
    D Only conclusions I and III follow Correct Answer Incorrect Answer

    Solution

    Some Key are Lock (I) + No Lock is Door (E) тЖТ Some Key are not Door (O) + Some Door are Window. (I) тЖТ No conclusion. Hence neither conclusion I nor III follow.
    No Lock is Door (E) + Some Door are Window (I) тЖТ Some Window are not Lock (O*). Hence conclusion II follows.

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