There's an explanation of the solution here for those who don't want to play the video in the article: http://en.m.wikipedia.org/wiki/Wason_selection_task http:

There's an explanation of the solution here for those who don't want to play the video in the article: http://en.m.wikipedia.org/wiki/Wason_selection_task http://en.m.wikipedia.org/wiki/Wason_selection_task