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      Question

      Statement : No stool is a desk.

      >                           Some desk are tables.                                All tables are chairs.                                Some chairs are benches. Conclusion :      No chair is a stool.                             Some benches are desks.                             Some desks are chairs.                             Some desks may be stools. In each of the questions below are given three statements followed by three conclusions numbered I, II and III and IV. 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.
      A Only I and III follow Correct Answer Incorrect Answer
      B Only II and III follow Correct Answer Incorrect Answer
      C Only I, II and III follow Correct Answer Incorrect Answer
      D Only III and IV follow. Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      E + I = O*. Hence, conclusion I will not follow. Some desks are tables (I) + All tables are chairs (A) ⇒ Some desks are chairs (I) + Some chairs are benches (I) ⇒ No conclusion. Hence, conclusion III will not follow. Some desks are tables (I) + All tables are chairs (A) ⇒ Some desks are chairs (I) ⇒ Hence, conclusion III will  follow.  No stool is a desk (E) ⇒ conversion ⇒ Some desks are not stools (O) ⇒ probable conclusion ⇒ Some desks may be stools (I). Hence , conclusion IV will follow.  

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