I don't fully follow the explanation provided. My problem is that at least once during the S&N and/or Quantitative lessons there was instruction that said you can only reduce not increase i.e. all to most and most to some. Could you explain what rule triggers an exception or simply how A -> Y is the correct answer? Thanks very much in advance.
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Hi, we are looking for an additional premise that, if added, would prove the conclusion. Here we know that most As are X, and we are trying to prove that there is at least one YX. Let's make this a bit more common sense here: we know that most apple are exceptional, and we want to prove there is at least one exceptional thing that is yellow.
How would we do that? If we knew that all apples are yellow (or that most apples are yellow) we would know for sure that there is at least one exceptional thing that is yellow. So, if A -Y were true, it would prove the conclusion.
