December 2000 LSAT Section 4 Question 10

Which one of the following pairs of birds CANNOT be among those birds contained in the forest?

MaddieS on March 26, 2023

How can J and S be a pair

isnt the rule if no J then S. The contrapositive would be if no s then J correct? So how would it be possible for J and S to be a pair in the forest?

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Emil-Kunkin on March 27, 2023

The rule is if No J then S and if No S then J.

This doesn't ban them both from being in, rather, it bans them from both being out. The rule is triggered by one of them being out. In this case neither sufficient condition is met.