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Determinati propietatea caracteristica a elementelor multimii : a) A= {0, 1, 2 , 3, 4, 5, 6, } ; b) B={ 15, 30, 45, 60, 75, 90, } ; c) A= { 3, 6, 9, } ; d) C= { 3, 4, 5, 6, 7, 8 } ​