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Math Help - is this a valid argument?

  1. #1
    Senior Member
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    is this a valid argument?

    http://img106.imageshack.us/img106/9002/30923091vz7.jpg

    is that correct?

    i thought it would looke more like

    if p then q

    not q

    therefore, not p

    they have two not q's

    please check.
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  2. #2
    MHF Contributor

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    That is a typo. It should be ~p.
    It is a valid argument.
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  3. #3
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    I think the correct conclusion should be (not p) since its mentioned in the soultions that the answer is based on
    Modus Tollens.

    MMM88.
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