Question
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements. Statements: Some Fear is Laugh. All Happy is Laugh. No Happy is Sorrow. Conclusion I: Some Laugh can never be Sorrow. II: Some Happy is Fear.
Solution
All Happy is Laugh (A) → Conversion → Some Laugh is Happy (I) + No Happy is Sorrow (E) → Some Laugh is not Sorrow (O). Hence conclusion I follows. Some Fear is Laugh (I) + [All Happy is Laugh (A) → Conversion] → Some Laugh is Happy (I) → No conclusion. Hence conclusion II does not follow.
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