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    Question

    Of the following two statements, both of which cannot be

    true, both can also be false. Which are these two statements? I. All machines make noise II. Some machines are noisy III. No machine makes noise IV. Some machines are not noisy
    A I & II Correct Answer Incorrect Answer
    B III & IV Correct Answer Incorrect Answer
    C I & III Correct Answer Incorrect Answer
    D II & IV Correct Answer Incorrect Answer

    Solution

    All machines make noise No machine makes noise Both are statement cannot be true also both can be false Hence,  I & III 

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