44 Game 3
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In my book, rule 5 is "the site visited third dates from a more recent century than does EITHER the site visited first OR that visited four". This would be 3 > 1 or 4, right? I am confused, I am not sute if my book is wrong or I´m not writing the rule properly. Thanks.
Your book (and what you've written here) is correct.
It's confusing! Let's try to derive a rule of grammar.
Remember when we learned that on this test, we are always to presume the inclusive version of the word "or" unless we are explicitly told otherwise?
This is a little like that.
"Thing X does something better/faster/slower/earlier than does either Thing Y or Thing Z" will always mean that X is better (faster, whatever) than both Y and Z.
It may help to think of it this way: The sentence "Thing X does its work better than does either Thing Y or Thing Z" means EXACTLY THE SAME THING AS "Thing X does its work better than either of them do." So in this case, you could correctly reformulate Rule 5 as "3 is more recent than either of them are" (where "them" is talking about 1 and 4).
The only way to indicate that X is better than at least one of them would be to include those words: "Thing X does something better (etc.) than at least one of Thing Y and Thing Z."
The only way to indicate that X is better than one of them but not both is to include those words: "Thing X is better than Thing Y or else Thing Z, but not both."
If it helps at all, I think this phrasing ("X is better than either Y or Z") is intended to avoid the ambiguity of combining Y and Z.
In other words, for example, if you said that "X costs more than Y and Z", it's possible that you mean "X costs more than the two of them combined." So if you say "X costs more than either Y or Z does," you at least make it clear that X is more than each of them individually (though maybe not more than both together).