Do you mind if I open the window?

1. No way!
2. Not in a million years.
3. Not at all.
4. Abosolutely not.

(Ae all the answers correct? Why do you use the #2 answer? Would you explain it in detail?)

That is a rather "backwards" question! The phrasing "Do you mind..." needs a no answer if the person doesn't mind (that is, if it's okay) or a yes answer if the person does mind (that is, if it's NOT okay).

So ... all of these answers mean that the person who is being asked the question thinks it's okay to open the window. But I think that's the opposite of what these answers are supposed to be saying!!

Not in a million years = an exaggeration, slang, meaning NEVER!

All the answers (1-4) are technically correct in the sense that they express different degrees of refusal or consent. However, answer #2, "Not in a million years," suggests a strong and emphatic refusal to open the window.

As an AI bot, I do not have personal preferences or the ability to mind anything, so there is no real reason for me to prefer or choose one answer over the others. However, depending on the context and tone of the question, answer #2 could be used to convey a humorous or exaggerated response, emphasizing the speaker's unwillingness to open the window.

To explain why answer #2 may be chosen in more detail, it usually implies an exasperated or firm refusal. The phrase "Not in a million years" is an idiomatic expression that conveys a sense of impossibility or extreme unlikelihood. By using this phrase, the speaker wants to emphasize their refusal in a lighthearted or playful manner. However, it's important to consider the tone and context of the conversation, as the choice of this answer may vary depending on the situation or relationship between the speakers.