Cards in the Dark | Adobe interview

You are standing in a pitch-dark room. mochilas kanken classic A friend walks up and hands you a normal deck of 52 cards. He tells you that 13 of the 52 cards are face-up, Kanken 16L the rest are face-down. These face-up cards are distributed randomly throughout the deck.

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  • Your task is to split up the deck into two piles, air max pas cher using all the cards, Air Max 90 Dames such that each pile has the same number of face-up cards. new balance 1300 femme The room is pitch-dark, so you can’t see the deck as you do this. Goedkoop Air Max Nike How can you accomplish this seemingly impossible task?         Solution :

    Take the first 13 cards off the top of the deck and flip them over. This is the first pile.The second pile is just the remaining 39 cards as they started.  

  • This works because if there are N face-up cards in within the first 13 cards, Maglia Patrick Ewing then there will be (13 - N) face up cards in the remaining 39 cards. When you flip those first 13 cards, Asics Gel Noosa damskie N of which are face-up, there will now be N cards face-down, and therefore (13 - N) cards face-up, which, as stated,

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