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The 4 Card Test

This is a famous problem in the study of deductive reasoning and logic.

You are shown a set of four cards placed on a table, each of which has a number on one side and a colored patch on the other side.

The visible faces of the cards show 3, 8, red and brown.

Which card(s) must you turn over in order to test the truth of the proposition that if a card shows an even number on one face, then its opposite face is red?


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