>>81
(1) (1/3)/3 = 1/9
(2) (1/3 + 1/3 + 1/3)/3 = 1/3
(3) (2/3 + 2/3 + 2/3)/3 = 2/3
(4) ((1/3)^3 + (1/3)^3 + (1/3)^3)/3 = (3/27)/3 = 1/27