terima kasih banget yang jawab no.5

dik: A={6,7,8,9,10,11,12,...dst}
B={4,5,6,7}
C={6,7,8,9}

a.(A n B) u (B n C)
={6,7} u {6,7}
={6,7}
b.( A u C) n ( A u B)
={6,7,8,9,10,11,12.....dst} n {4,5,6,7,8,9,..dst}
={6,7,8,9,10,11,...dst}

moga membantu maaf kalau slh