Sufficient & Necessary Questions - - Question 15

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burdal December 30, 2022

"or both"

I got the answer right, as I focused on the concept of not M or not I in the correct answer choice. However, how can we understand the addition of "or both" in our diagrams?

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Emil-Kunkin January 24, 2023

Hi, I think that the idea of "or both" is just showing that two things are not mutually exclusive. If you want to add it to a diagram, I often just use "OrB" as an abbreviation.