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.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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