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skylerm625on October 2, 2018
Finding Missing Premises
Hi! So I have a quick question about finding missing premises. How do you know which variable will be the sufficient and necessary condition when I'm guessing the missing premise? More often than not I can guess the correct relationship and the right two variables it involves, but my variables won't be in the same order that your answer puts them in. Is there a pattern I'm missing?
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Hi @skylerm625, thanks for your post. In terms of whether your variables are in "the same order" as the answers on our drills - sometimes that's just a simple matter of whether you're thinking in terms of the positive or the contrapositive. Remember that the contrapositive is logically equivalent to the positive. So "A ==> B" is logically equivalent to its contrapositive, "not B ==> not A." Perhaps that is what's happening (i.e., you're thinking in terms of the positive, and the answer on the drill is in terms of the contrapositive)? Let us know if that helps or if you have a specific example you'd like help working through.
