P: not C → not XP: ? C: X → not D

tdc062786 January 25, 2018

Confused

In the conclusion, X> not D did not become D> not X. Why is that??

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Mehran February 4, 2018

Hey @tdc062786, thanks so much for your post. You caught a typo on our end! We have fixed it. Exit the app and reload it, and it should be corrected. Please let us know if you continue to have difficulty. Sorry for the inconvenience, and nice catch.

jdsark February 20, 2018

Good eyes

Samantha-Alexis July 13, 2019

Yeah just noticed that. Same answer though right?

Ravi July 30, 2019

@Samantha-Alexis, correct! Same answer. The typo was just in the explanation of the answer choice. Let us know if you have any other questions!