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Cards Facing Up Puzzle - Solution
The Puzzle:
Sam is blind-folded and handed a deck of 52 cards and told that exactly 10 of these cards are facing up.
The task is to divide those cards into two piles, each with the same number of cards facing up.
Without peeking, getting help, or damaging the cards how does Sam do this?
Our Solution:
Sam divides the cards into two piles with 10 and 42 cards each ... then simply flips all cards in the smaller pile.
Done!
Puzzle Author: Unknown