Question
Statements: Some papers are copies. No copy is a
diary. Some diary are cardboard. Conclusions:I. No diary is papers. II. Some papers are diary. In each of the questions below are given three statements followed by three conclusions numbered I and II. 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 given conclusions logically follows from the given statements disregarding commonly known facts. Give answerSolution
Some papers are copies (I) + No copy is a diaries (E) = Some papers are not diaries (O). Hence, neither conclusion I nor II will follow. However, Conclusion I and II make a complementary pair, hence, either conclusion I or II will follow. ALTERNATE METHOD: All possible cases:  
  
  In case A, no paper is a diary and in case B & C some papers are diary. Thus, either of them is true.
 In case A, no paper is a diary and in case B & C some papers are diary. Thus, either of them is true.  
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