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Mind & EverydayMental model

Fewer than 10 percent solve this four-card task.

Four cards show 3, 8, blue and red. Rule: "if a card shows an even number, its other side is blue." Which do you turn? The answer is 8 and red – you must look for the possible counterexample. Framed as a social rule ("drinkers must be over 18") most people get it.

Useful: Test rules by hunting for the case that would refute them, not for confirmation.

Source: en.wikipedia.org

DenkwerkzeugeEntscheidungen

Difficulty:

Question on this card

Which cards must you turn for "even number ⇒ blue on the back"?

  1. 3 and blue
  2. 8 and blue
  3. 8 and red
  4. All four
Show the answer

Correct: 8 and red

Only the 8 and the red card can possibly falsify the rule.

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This card belongs to the topic Mind & Everyday. Every card is short, cites a source and can be saved – due ones come back by themselves later.

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