@Jake. Wondering this as well, he started using these terms in lessons without a dedicated lesson in my study plan

How would you know to map it in reverse order if you were seeing this question for the first time? I got this question right because the answer linked the two premises that weren't in the conclusion, but I didn't actually understand why that was the missing link. #help

I find the handwritten notes very hard to follow.

And I agree that LSAT style questions incorporated would be much more beneficial to absorb this information. We all took some form of science classes in school; we know what hypotheses are. What we don't know is how the LSAT use these to trick us!

@anjjredd For groups 3 and 4 you can negate either idea, but only the 1 you choose to make the sufficient (group 3) or necessary (group 4) condition. The other side is not negated, which is the difference from the contrapositive where you negate both sides!