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s= {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19}
a= {2,4,6,8,10,12,14,16,18}
b= {1,3,5,7,9,11,13,15,17,19}
a sama dengan b = salah
a invers sama dengan b = ini benar (B)
a irisan b sama denan S = salah
a gabungan b = beda setangkup = salah
30.
s = {1,2,3,4,5,6,7,8}
a = {1,2,3,4,5}
b = {2,4,5}
komplemen dari a = {6,7,8}