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Noteaza numarul care urmeaza in sirul de mai jos:1,2,4,6,9,12,15,19,23,27,31,___

Răspuns :

1,2,4,6,9,12,15,19,23,27,31,35
1,2 e diferenta 1
4,6, e diferenta 2
9,12,15 diferenta 3
19,23,27,31,35 diferenta4