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Calculați: a {3, 4, 7, 11} U {1, 2, 3, 4, 5, 6}; c {8, 3, 10, 5, 7} \ {1, 2, 3, 4, 5, 6, 7)}; b {7, 13, 8, 5} n {0, 2, 4, 6, 78} d {0, 1, 2, 3} n {1, 2, 3, 4} n {2, 3, 4, 5).
Dau coroana, repede​