# Thread: is this a valid argument?

1. ## 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

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

3. I think the correct conclusion should be (not p) since its mentioned in the soultions that the answer is based on
Modus Tollens.

MMM88.