10%not even this many solved it
Your guess
Showing: 3, 8, blue, red. Rule: even number → opposite side blue. Turn which?
More about it
In Wason's study, not even one in ten found the solution. But if the rule is "If you drink alcohol, you must be over 18" – with cards like "16", "drinking beer", "25" and "drinking soda" – most people have no trouble. Some researchers see a sense for catching cheaters behind this.
