I think both of them are, because none of the problems are really good for explaining your thought process.  In fact, it is a contradiction to try and think about a solution to a problem and to give a dissertation on how you&#x27;re thinking about the problem.  You can do one or the other, and in the latter case you have to have solved the problem previously.<p>What I do is ask people about a problem they have solved and get them to teach me about it.  If I learn something then it&#x27;s a good result.<p>Asking people to solve a trivial problem AND let you into the inner workings of their brain-- normally a non-verbal activity- isn&#x27;t testing their abilities.