ruby -v ruby 1.8.7 (2008-08-11 patchlevel 72) [i386-mswin32] -------------- a= [1,2,3,4,5] p a.inject(0){|a,b| a += b} #=> 15 p a #=> 15 b = [1,2,3,4,5] p b.inject(0){|a,b| a += b} #=> 15 p b #=> 5 x = [1,2,3,4,5] p x.inject(0){|a,b| a += …