Four Card Puzzle

‘Cause it’s been awhile since we’ve had a good puzzle.

You’re sitting at a table with four playing cards on it. Two are face up and two are face down. You see an 8, a King, a red-backed card, and a blue-backed card.

You’re told that all the Kings in front of you have red backs. What is the maximum number of cards you have to turn over to test if that’s true? Which cards do you turn over?

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