Is it a fair die? I'd be naturally suspicious of anyone offering me 'free money' in such a game. But, assuming it was legit, presumably < E[x] = $3.50/game, as

Is it a fair die? I'd be naturally suspicious of anyone offering me 'free money' in such a game. But, assuming it was legit, presumably < E[x] = $3.50/game, assuming a decent number of games to average over. If it were a single game, I'm not entirely sure how I'd play - 3/6 outcomes result in losing money at $3.50, but where between $1 (always win - who would play against you?) and $6 (best reward, but -$5 potential loss) I guess that depends on your personal risk tolerance. On your second point - I think I did originally misunderstand the question, and only on re-reading did it actually make sense. I hope I'd ask for clarification in an interview situation, or at least confirm my understanding is correct if it seemed off.