PT71.S3.Q24 (Cameras and Concrete) - Does the Video have the Contrapositive Mixed Up?

tonypepperoni

The 7sage video says that the stim. says:

S -> (U or C)

thus, S -> (C -> U)

But this doesn't seem right?

Shouldn't the contrapositive instead be: (U and C) -> S ?

This question is in general very frustrating and confusing, but I need to understand how J.Y. came to the conclusions he came to.

Admin Note: https://7sage.com/lsat_explanations/lsat-71-section-3-question-24/

canihazJD

Thats not a contrapositive. He's saying in the world of S, you must have U or C. Therefore in the world of S, if you don't have C then you have to have U.

If A, then B or C.
A
B

---

Therefore C