New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    In the following question below are given some statements

    followed by some conclusions based on those statements. Taking the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusion logically follows the given statements. Statements:All Deaf is Blind. No Deaf is Dumb. Some Dumb is Lame. Conclusions: I. Some Lame is not Blind. II. No Dumb is Blind. III. All Blind is Deaf.
    A Only conclusion II follows Correct Answer Incorrect Answer
    B Only conclusions I and II follow Correct Answer Incorrect Answer
    C None of the conclusions follow Correct Answer Incorrect Answer
    D Only conclusion III follows Correct Answer Incorrect Answer

    Solution

    No Deaf is Dumb (E) + Some Dumb is Lame (I) → Some Lame is not Deaf (O*) + All Deaf is Blind (A) → No conclusion. Hence conclusion I does not follow.

    No Deaf is Dumb (E) → Conversion → No Dumb is Deaf (E) + All Deaf is Blind (A) → Some Blind is not Dumb (O*). Hence conclusion II does not follow.

    All Deaf is Blind (A) → Conversion → Some Blind is Deaf (I). Hence conclusion III does not follow.

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