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Completeaza corect sirurile cu inca trei numere :20,30,40.....,71,61,51.....,25,30,35...

Răspuns :

20,30,40,50,60,70

71,61,51,41,31,21

25,30,35,40,45,50
20, 30, 40, 50, 60, 70
71, 61, 51, 41, 31, 21
25, 30, 35, 40, 45, 50