# Divide The Cards Into Two Piles Puzzle

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Two friends were stuck in a cottage. They had nothing to do and thus they started playing cards. Suddenly the power went off and Friend 1 inverted the position of 15 cards in the normal deck of 52 cards and shuffled it. Now he asked Friend 2 to divide the cards into two piles (need not be equal) with equal number of cards facing up. The room was quite dark and Friend 2 could not see the cards. He thinks for a while and then divides the cards in two piles.

On checking, the count of cards facing up is same in both the piles. How could Friend 2 have done it ?

posted Oct 2, 2014
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A Blind-folded man is handed a deck of 52 cards and told that exactly 10 of these cards are facing up. He is asked to divide those cards into two piles, each with the same number of cards facing up.

He can't peek, get help, or damage the cards, but may use any strategy that occurs to him to do so.

How can he do it?

Note: Think out of box