P: A → not BP: C → XP: not B → CC: ?

Chrgonz12 November 13, 2016

What's the difference?

I put X->A. What's the difference? The same conclusion is drawn in my mind, which is that they are equal to each other. I keep missing these, but also getting them right, just backwards. My reasoning is sound, but for some reason I always get the answer backwards from what the drill answer is? Which lesson can I review to increase my understanding of these questions?

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Mehran December 3, 2016

@Chrgonz12 X ==> A is NOT the same as A ==> X.

Please watch our video lesson on Sufficient & Necessary conditions for an in-depth review of these concepts.

Hope it helps! Please let us know if you have any other questions.

Chrgonz12 December 13, 2016

I'm unable to view your response. Thank you for your time.

kuriku October 9, 2017

I have the same problem. Your response was not helpful

Mehran October 10, 2017

@kuriku you cannot see the response?

Or you can see the response and you just didn't find it helpful?

vanessaarlene24 December 4, 2017

I saw your lesson on this but it doesn't really break it down for me to understand these types of questions, can you break it down cause as of right now I can't get to any conclusions