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      Question

      Some laptops may be buses. Some buses are not mouse.

      Some pendrives may be buses. In the given question, a set of conclusions is given. There are five options comprising of three or more statements. You need to choose the option that contains the set of statements from which the given conclusions logically follow.
      A No laptop is a mouse. No bus is a pendrive. All mouse are keyboards. Some keyboards are buses. Correct Answer Incorrect Answer
      B Some laptop are mouse. All mouse are keyboards. No keyboard is a bus. Some buses are not pendrive. Correct Answer Incorrect Answer
      C Some keyboard is buses. No bus is a pendrive. Some laptops are mouse. No mouse is a keyboard. Correct Answer Incorrect Answer
      D Some mouse are keyboards. Some keyboards are buses. Some laptop are mouse. All buses are pendrives. Correct Answer Incorrect Answer
      E Both 3rd and 4th Correct Answer Incorrect Answer

      Solution

      Some laptop are mouse (I) + All mouse are keyboards (A) ⟹ Some laptops are keyboards (I) + No keyboard is a bus (E) ⟹ Some laptops are not buses (O) ⟹ [Probable conclusion] ⟹ Some laptops may be buses (I). All mouse are keyboards (A) + No keyboard is a bus (E) ⟹ No mouse is a bus (E) ⟹ Conversion ⟹ Some buses are not mouses (O). No bus is a pendrive (E) ⟹ Conversion ⟹ Some pendrives are not buses (O) ⟹ [Probable conclusion] ⟹ Some pendrives may be buses (I). By elimination method - By option 1 and 3, no +ve conclusion can be drawn between pendrive and buses. Hence it is eliminated. By option 4, there is no –ve conclusion. Hence it is eliminated. By option 2, the conclusion can be drawn. Hence answer is 2.

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