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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That is a typo. It should be ~p. It is a valid argument.
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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