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determinati nr multimilor B stiind ca {1,2} inclus in B inclus in {1,2,3,4,5}

Răspuns :

B poate fi {1,2}, {1,2,3},{1,2,4},{1,2,5},{1,2,3,4},{1,2,3,5},{1,2,4,5},{1,2,3,4,5}

O seara buna!