Long Division
1/9 = 0.111... 9 x (1/9) = 9 x 0.111... 1 = 0.999...
Digit Manipulation
X = 0.999... 10X = 9.999... 10X - X = 9.999... - 0.999... 9X = 9 X = 1
Source : http://en.wikipedia.org/wiki/0.999...#Digit_manipulation
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