http://codepad.org/rdSirAkD http://codepad.org/rdSirAkD -- Solution to third problem in 26 lines of ruby _without_ using combinations. It's pretty fast too, giv

http://codepad.org/rdSirAkD http://codepad.org/rdSirAkD -- Solution to third problem in 26 lines of ruby _without_ using combinations. It's pretty fast too, gives the answer in 0.020s.