That can be pretty easily compensated for by asking the candidate to explain their thinking out loud (which you&#x27;d want to do anyway).  Someone who&#x27;s seen it before will be too perfect: they&#x27;ll just rattle off a solution and it&#x27;ll be right.  Someone who&#x27;s actively working through it will pause, they&#x27;ll hesitate, they&#x27;ll get things wrong and have to correct themselves.<p>I&#x27;ve occasionally seen candidates who had the answers to interview questions I asked.  They actually came clean and said they&#x27;d heard it before, but I was already pretty suspicious that they were actively familiar with the question.