June 2020 LSAT Section 1 Question 19

Which one of the following representatives could be the only representative who presents?

Jared-Jackson on August 6, 2022

Why not S?

I see how Q can be the only rep. I'm not seeing how S cannot be by itself too. This led to a problem for me on question 21 as well. Thank you!

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Emil-Kunkin on August 8, 2022

Hi Jared,

This relates to the Q/P rule.

We know that if not Q then P, and the contrapositive is if not P then Q.

So, we know that at least one of Q or P must present.