Sufficient & Necessary Questions - - Question 22

Everyone who is a gourmet cook enjoys a wide variety of foods and spices. Since no one who enjoys a wide variety of f...

sharpen7 March 9, 2018

Valid contra trans vs. valid positive trans

For this question I wrote out the valid contra trans but I was not sure that was the type of argument because I also wrote out the valid positive transitive= GC->WVFS-> not PBF. I picked A because it had the valid positive transitive and Mehran has told me that the "contrapositive is identical in meaning."

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sharpen7 March 9, 2018

Can you please explain why it was not the valid positive in this case and only the valid contra?