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1/3x < 50.000
x < 150.000
atau
uang mula2 kurang dari 150.000
A = {2 , 3 , 5 , 7 , 11 , 13 , 17 , 19}
B = {1 , 3 , 5 , 7 , 9}
A n B = {anggota a yang ada di B}
= { 3 , 5, 7, 9}
= { B }