Posted by Sarah on Thursday, May 16, 2013 at 7:21pm.
The squares of a 2×500 chessboard are coloured black and white in the standard alternating pattern. k of the black squares are removed from the board at random. What is the minimum value of k such that the expected number of pieces the chessboard is divided into by this process is at least 20 ?

Math  steph, Friday, May 17, 2013 at 12:53pm
13

Math  Gandu man, Saturday, May 18, 2013 at 10:27am
wrong
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