Except that my experience is interviewers (in general) prefer to discuss abstract math puzzles they clearly looked up in a book themselves to exploring a releva

Except that my experience is interviewers (in general) prefer to discuss abstract math puzzles they clearly looked up in a book themselves to exploring a relevant question I propose from their actual business domain. I don't mind "how would you implement this basic server idea" or even "talk me through how you'd explore this algorithm puzzle", but I've definitely been docked for not having $OBSCURE_INSIGHT to $RANDOM_PUZZLE in 15 minutes, nevermind that I can usually get them sometime that evening when not standing at a whiteboard being interrupted when I pause narrating for 15 seconds to think, which is an appropriate timeline for any actual algorithms work. (I mean, I can count how many times in my career solving a math puzzle couldn't wait a single day: 0.) Of course, I suspect some of those interviews are designed to fail you as part of H1B scams.