Question #909

P or O in every group

Started by MadisonVanNatter · started 2022-08-09 02:40 · last activity 2024-01-15 15:39 · 1 reply

Hello I was watching one of the question explanations and one of the deductions made was that O or P has to be in every group, but the video didn't explain that deduction a lot so I was wondering if you could go into more detail about that deduction because as I was working through the set I believe an acceptable group layout is 1: GPY 2:GR 3:OR.

Replies

  1. Emil-Kunkin · 2024-01-15 15:39

    This is an implication of the final rule. The final rule is that if not p then o, and the contrapositive of this is that if not o then p. This means that at least one of o or p must always be in. In other words, they cannot both be out.

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