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B={1,6,11,...,501}
C={1,3,6,10....210}
prin proprietate caracteristica


Răspuns :

b=( 1,6,11,16,21,26,31,36,41,46...) - din 5 in 5
c=(1,3,6,10,15,21,...) - incepind cu 210 de la cel mai mare nr scadem