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The magician shows 3 cards to the audience 2 black cards, and between them a red card.
He turns the cards face down and mixes them.
He then offers $10 to any member of the audience who can pick out the red card.
Of course they will fail, but that's ok, let them try again after all, with only 2 cards left the odds of finding the red card are much better!
But they fail again!!
And now comes the real surprise - it turns out that the 3rd card is also black!
All cards can immediately be examined!