Resistance to Cognitive Biases Test

Below are 4 cards. They are randomly chosen from a deck of cards in which every card has a letter on one side and a number on the other side.

Your task is to identify which of the cards you need to turn over in order to find out whether the following rule is true or false.

The rule is: if the card has a letter "A" on one side, then it has a number "4" on the other side.

Turn over the minimum number of cards that you need to check the rule.

6cards

Which is the correct answer?

a) box 3 only

b) boxes 1, 2, 3 and 4

c) boxes 3 and 4

d) boxes 1, 3 and 4

e) boxes 1 and 3

7resistance

Answer

Most people answer "e"; the correct answer is "c"

Rationale: what you need to do is prove the rule. To do this you need to turn over the cards displaying

- the letter "A" (disproving the number other than "4" is on the other side)

- the number "7" (disproving if letter other than "A" is on the other side)

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