Răspuns :
A={1,2,3,4,5}
B={4,5,6,7,8,9}
C={3,4,5,6,9}
AUB={1,2,3,4,5,6,7,8,9}
CUB={3,4,5,6,7,8,9}
A∩B={4,5}
A∩B∩C={4,5}
A-B={1,2,3}
AUBUC={1,2,3,4,5,6,7,8,9}
B={4,5,6,7,8,9}
C={3,4,5,6,9}
AUB={1,2,3,4,5,6,7,8,9}
CUB={3,4,5,6,7,8,9}
A∩B={4,5}
A∩B∩C={4,5}
A-B={1,2,3}
AUBUC={1,2,3,4,5,6,7,8,9}