a) AUB = {3,4,5,6,7,8}
b)AUK = {1,3,4,5,7}
c)BUC = {2,4,5,6,7,8}
d)CUK = {1,2,3,4,5,7,8}
e)AnB = {5}
f)CnB = {8}
h)BnK = {5,7}
i)A/K = {4}
j)C/A = {2,8}
k)K/B = {1,3}
l)K/A = {1,7}