October 7, 2015

Homework Help: GEOmetry(Special Coin Placement)

Posted by please help me out!! on Tuesday, April 2, 2013 at 3:56am.

Three coins are randomly placed into different positions on a 4×10 grid. The probability that no two coins are in the same row or column can be expressed as a/b where a and b are coprime positive integers. What is the sum of a+b?

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