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B = { 2,1,5}
gabungan A dan B = { 1,2,3,4,5,6,} dan seterusnya
B = {2,1,5}
(A gabungan B) - A = ({1,2,3} gabungan {2,1,5}) - {1,2,3) = {1,2,3,5} - {1,2,3} = {5}
maaf klo gak mudeng ato lebih mudahnya gambar diagram Venn nya aj jadi ledih mudah. and maaf klo jawabanku salah