In the Wason four-card problem, each card has a letter on on…
In the Wason four-card problem, each card has a letter on one side and a number on the other. The rule is “If there is a vowel on one side, then there is an even number on the other side.” Imagine you are presented with the cards A, 8, M, and 13. Research shows that in addition to turning over the A, people often want to turn over the 8 but they really need to turn over the 13. Why?
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