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Fie multimea A={20 ,40;60;80.......,2000}si B ={50,100,150,......,2000} NR DE ELEMENTE AL MULȚIMII AUB CARE ESTE ?

Răspuns :

AUB={100,200,300,400,500,600,700,800,900,1000,2000}
AUB ( A reunit cu B ) = { 20,40,50,60,80,100, 120, 140,150,160,180,200, 220,240,250,260,280,300 si tot asa pana la 2000 ;)