Yes, its a bit weird. I was replying because I thought (perhaps getting the wrong end of the stick) that you were confused about what the question was, not (as it seems now) pointing out that the question (in your view) is open to being confused.
In probability theory the phrase “given that” is a very important, and it is (as far as I know) always used in the way used here. [“given that X happens” means “X may or may not happen, but we are thinking about the cases where it does”, which is very different from meaning “X always happens”]
A more common use would be “What is the probability that a person is sick, given that they are visiting a doctor right now?”. This doesn’t mean “everyone in the world is visiting a doctor right now”, it means that the people who are not visiting a doctor right now exist, but we are not talking about them. Similarly, the original post’s imagined world involves cases where odd numbers are rolled, but we are talking about the set without odds. It is weird to think about how proposing a whole set of imaginary situations (odd and even rolls) then talking only about a subset of them (only evens) is NOT the same as initially proposing the smaller set of imaginary events in the first place (your D3 labelled 2,4,6).
But yes, I can definitely see how the phrase “given that”, could be interpreted the other way.
Yes, its a bit weird. I was replying because I thought (perhaps getting the wrong end of the stick) that you were confused about what the question was, not (as it seems now) pointing out that the question (in your view) is open to being confused.
In probability theory the phrase “given that” is a very important, and it is (as far as I know) always used in the way used here. [“given that X happens” means “X may or may not happen, but we are thinking about the cases where it does”, which is very different from meaning “X always happens”]
A more common use would be “What is the probability that a person is sick, given that they are visiting a doctor right now?”. This doesn’t mean “everyone in the world is visiting a doctor right now”, it means that the people who are not visiting a doctor right now exist, but we are not talking about them. Similarly, the original post’s imagined world involves cases where odd numbers are rolled, but we are talking about the set without odds. It is weird to think about how proposing a whole set of imaginary situations (odd and even rolls) then talking only about a subset of them (only evens) is NOT the same as initially proposing the smaller set of imaginary events in the first place (your D3 labelled 2,4,6).
But yes, I can definitely see how the phrase “given that”, could be interpreted the other way.