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Haha, I did the same thing for a question (for initial guess, not sanity check)! Problem is, when I got home, i checked it and it was incorrect. It seems to me that They foresee people trying to outsmart Them, and put in a bogey answer. Having said that, it does seem a sensible way to sanity...

Did the HVAC Depth I found it pretty rough going - some tricky questions in there.