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April 19, 2014

Homework Help: maths

Posted by hemant on Wednesday, May 8, 2013 at 6:59am.

The squares of a 33 board are randomly coloured black or white. Let W be the number of white squares and B the number of black squares. The expected value of |B−W| can be expressed as ab where a and b are coprime positive integers. What is the value of a+b?

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