p--->q or r not q ^not r ___________ therefore not p Is this valid by Modus tollens???? or is it invalid because you can not go in reverse order??? Thank you to anyone who can untangle my thinking on this one.
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Originally Posted by frostking2 p--->q or r not q ^not r ___________ therefore not p Is this valid by Modus tollens??? It is valid by Modus tollens.
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