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For Wason Selection Task, if the rule is 'If P, then Q', the correct answer is :

  • A.P, Q
  • B.P, Not Q
  • C.Not P, Q
  • D.Not P, Not Q

Answer: B

The correct cards to turn are P and Not Q.

A rule 'If P, then Q' is broken only by a case where P is true and Q is false. So the cards that could falsify it are the P card (in case its other side is not Q) and the Not Q card (in case its other side is P).

Most people pick P and Q, which shows confirmation bias: the Q card cannot falsify the rule whatever is on its back. The Not P card is irrelevant, because the rule says nothing about what happens when P is false, so the pairs with Not P are also wrong.

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