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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

1) 50,60,70
2)41,31,21
3)40,45,50