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Numerele de doua cifre care au cifra zecilor mai mica decat cifra unitatilor?

Răspuns :

12,13,14,15,16,17,18,19
23,24,25,26,27,28,29
34,35,36,37,38,39
45,46,47,48,49
56,57,58,59
67,68,69
78,79
89