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    Question

    Some plastics are not elastics. Some rubbers are not

    fibres. Some elastics are not fibres. 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 Some fibres are elastics. All elastics are rubbers. All plastics are fibres. Correct Answer Incorrect Answer
    B Some elastics are rubbers. Some plastics are fibres. No fibre is an elastics. Correct Answer Incorrect Answer
    C Some fibres are elastics. All elastics are rubbers. Some plastics are fibres. Correct Answer Incorrect Answer
    D No fibre is an elastic. No elastic is a rubber. No plastic is a fibre. Correct Answer Incorrect Answer
    E Both 1st and 3rd. Correct Answer Incorrect Answer

    Solution

    Some plastics are fibres. (I) + No fibre is a elastics. (E) ⇒ Some plastics are not elastics. (0) No fibre is an elastics. (E) + Some elastics are rubbers. (I) ⇒ Some rubbers are not fibres. (O*). No fibre is a elastics. (E) ⇒ Conversion ⇒ Some elastics are not fibres. (O) Hence, option 2 is correct.

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