You can produce a sum of two if you roll: (1) and (1)
So that is a 1/36 possibility
You can produce a sum of three if you roll: (1) and (2), (2) and (1)
So that is a 2/36 possibility
You can produce a sum of twelve if you roll: (6) and (6)
So that is a 1/36 possibility
Add all of the possibilities and you get 4/36= 1/9
