So, you’ve got 104 cards all shuffled together. Then you split them back into two equal piles. Well, you haven’t looked at them now, in the traditional manner. You just counted them out so you have a pile of 52 on one side–we’ll call that pile A–and a pile of 52 cards – pile B — on the other side, and they’re all mixed up. Here’s the question: What are the chances that the number of red cards in pile A equals the number of black cards in pile B? And question 2, or B: How many cards do you have to look at to be sure of your answer?
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Poker Party3 guesses to Poker Party |
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January 18th, 2010 | Category: 
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50% and look at 13 cards
52 cards and 100% that the number of red will equal number of black in other pile
Sam, thank you for solving this riddle. You are the winner!