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2. Calculați:
a) (2, 3, 5, 6, 7} {0, 4, 6, 8};
b) {1, 3, 5, 7, 9} \ {1, 2, 3, 4, 5, 6, 7, 8, 9);
c) (3, 4, 5} {0, 1, 6}{7, 8, 9, 10}.