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Neighbors or not? (Posted on 2016-03-22) Difficulty: 2 of 5
If two cells are chosen randomly on a 8x8 chessboard what is the probability that they are neighbors (i.e. share a common side)?

No Solution Yet Submitted by Ady TZIDON    
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Solution Solution | Comment 2 of 3 |
There are 64C2 = 2016 ways to choose two random cells.
There are 8*7*2 = 112 ways to choose two adjacent cells (ways to place a 1x2 rectangle).
Then the probability is 112/2016 = 1/18.

  Posted by Brian Smith on 2016-03-22 13:25:51
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