Ceramic Tiles

Problem of the Week - March 06, 2023



You are building a new house.  Your builder designs a beautiful foyer with a tiled 8-by-8 foot area constructed by one-foot square ceramic tiles.  Upon inspection of the house, you notice that two of the one-foot tiles are cracked.  If the cracks randomly occurred after the tile was laid, what is the probability that the two cracked tiles share a common edge with each other?  In other words, the two cracked tiles are next to each other (but not diagonal)?

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