Lets say you have AK and whiff. Given some random 3/4/5 cards (flop turn river) on the board, what are the odds that your opponent has caught at least a pair? i.e. the odds that your A high is no good.
I'm only looking for a ballpark figure. This seems to happen a lot in 6-max where the BB defends with any two cards and leads out when the board is rags. Just trying to get an idea of what the numbers are on keeping a donker honest with A high.