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Calculati
a) {2,0,1,3} n {2,1,0,5} b) {3,1,2} {2,0,3}
c) {3,0,1,2} n N d) {2,0,1,3}-N*.
b) {3,1,2} {2,0,3}
d) {2,0,1,3}-N*.
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