jawaban soal di atas apa ya? mohon bantuanya

S = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}
A = {2,4,6,8,10,12,14}
B = {3,6,9,12,15}

(i). A∩B = {6,12} benar
(ii). A∪B = {2,4,6,8,10,12,14,15} salah
(iii). A-B = {2,4,8,10,14} benar
(iv). (A∪B)' = {1,5,7,9,11,13} salah

jadi, jawabannya yaitu A. (i) dan (iii)