tolong donk ,,,please,,,buat nanti

a. {4,5,6,8,11,12,13,14,15}
b. {1,2,3,10,11,12,13,14,15}
c. {1,2,3,4,5,6,7,13,14,15}
d. {4,5,6,8}
e. {8,11,12}

a. Ac = {4,5,6,8,11,12,13,14,15}
b.Bc={1,2,3,10,11,12,13,14,15}
c.Cc ={1,2,3,4,5,6,7,13,14,15}
d. AcnB ={4,5,6,8}
e.AcnC = {8,11,12}
f.BcnC ={10,11,12}
g.BcnA ={1,2,3,10}
h.CcnB={4,5,6,7}
i.CcnA={1,2,3,7}