The meaning is about the same. How should I know? is much more commonly used, and it's much more like a rude challenge from someone who is annoyed at being asked a question.
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The meaning is about the same. How should I know? is much more commonly used, and it's much more like a rude challenge from someone who is annoyed at being asked a question.
— I can't find the file I left on my desk this morning. Where is it?
— How should I know? (Go find it yourself.)
In contrast Why would I know? is not used as much. It's not s