[whatthefox]

+1000 This is how a proper professional does it.

I always have turned down homework assignments. It just feels insulting and disrespectful. Even whiteboard crap is useless but I'm OK with it considering they've paid for my travel expenses etc.

If you think about it ... homework assignments are a classic case of B's looking for C's. A's wouldn't need to resort to such silliness. They can identify (as an interviewer) and exhibit (as an A interviewee) with just an intelligent conversation.