July 2020 LSAT Section 1 Question 8

A person who does not have both a high school diploma and a demonstrated competence in the techniques of cardiopulmon...

Misspage17 on June 2, 2023

Why is A not correct?

I thought that A was correct from this logic: not ED--> not PW PW--> ED Please elaborate as to why this is not correct. Thank you!

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Emil-Kunkin on June 4, 2023

Hi, the original argument is

If not both X and Y, then not Z.
Mary has both X and y, so she will have Z.

This is far from the logic of A, which is

If not X or Y, then not Z.
Paul has Z, so must have X and Y.