The Grey Labyrinth is a collection of puzzles, riddles, mind games, paradoxes and other intellectually challenging diversions. Related topics: puzzle games, logic puzzles, lateral thinking puzzles, philosophy, mind benders, brain teasers, word problems, conundrums, 3d puzzles, spatial reasoning, intelligence tests, mathematical diversions, paradoxes, physics problems, reasoning, math, science.

   

Luck of the Draw

Your good friend Skinny Dakota stops by one afternoon for a friendly game of cards. Of course, you know Skinny well enough to suspect that any time there's a game being played, he'll be ready to make a quick buck at your expense.

But this time, he assures you it'll be different, "This game is complete chance, here I'll show you. Gotta deck of cards?"

You find a set of cards and hand them to him. Skinny proceeds to find nine cards: 2H, 3C, 4S, 5C, 6S, 7H, 8S, 9H, 10C. He hands the nine cards to you.Some lovely cards

"Group them by suit," he says.

You do as he instructs- you now have three groups of three cards.

"Now flip them face down and shuffle the cards within each pile, but don't mix the piles together."

When you've done this, he proposes the game:

"Okay, here's how this game is played. You pick a random card from any pile, but don't show me. Then I'll point to one of the other piles, and then you pick a random card from that pile. If your card is higher, I owe you a dollar. If my card is higher, you owe me a dollar. Can't be much fairer than that, can it?"

Knowing Skinny, it probably could be. But it does sound fair- so what's the catch?


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