The other day I came across an apparently famous logic puzzle called The Wason Selection Task. I say "apparently" famous because I for one had never heard of it, but I was instantly struck by the conditional nature of the process in question.

If you're reading this I presume you've got some experience with LSAT conditionality—and if you'd like more I've included a number of helpful links at the end of this post!—so let's put your knowledge to the test.

Take a look at the picture up top, where four cards are arranged before you, two with numbers, and two with colors. What you're told of these four cards is that each of them has a positive, whole number on one side (two of which are exposed at the moment) and a color on the other (again, two of which are shown). So the 3 and the 8 have a colored back, and the red and the orange have a numbered back. Simple enough right?

Here's the question then. Of those four cards, which card(s) MUST be turned over to test the rule that "if a card has an even number on one side, then its other side is red"? Indicate only the card(s) needed (that is, with the potential) to determine whether that rule has been broken here.

Think you've got it?

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