Bila s = {x | 0 < x < 12 } ; m = { x | 1 < x< 9 } dan N = { x | 0 < x < 5 }

S = {1,2,3,4,5,6,7,8,9,10,11}
M= {2,3,4,5,6,7,8}
N= {1,2,3,4}
MuN = { 2,3,4}
MnN = { 1,2,3,4,5,6,7,8}
M' = { 5,6,7,8}
N' = {1}