These specific "missing premise" and "argument completion" drills are not addressed by name in any of the lessons. However, you can take the skills that you have learned from the Sufficient & Necessary lesson video and apply them to these questions.
Firstly, you will need to understand the broad concept of sufficient and necessary conditions which are covered throughout the video.
You will also need to understand how to apply these principles to make logical arguments. You can find an explanation for this, as well as the 'contrapositive' at 24:30 in the video, although they are also covered throughout.
Finally, you will need to understand the 'transitive property.' An explanation for this begins at 1:13:23 in the Sufficient & Necessary lesson video.
Hope this helps! Please let us know if you have any further questions.
JeremyGMarch 26, 2019
Hey Victoria, thanks, I have watched and reviewed the concepts covered in that video. I understand that the contrapositives of the two premises here would be "If not Y, not X" and "If Y, not X," meaning that in all scenarios we would have not X.
VictoriaMay 15, 2019
Hi @JeremyG glad to hear the video was helpful and everything is making a bit more sense! Let us know if you have any further questions.
