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Cate nr naturale pare de forma ab cu a maimic decat b exista ?

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
Numar par de forma ab inseamna ca b=0,2,4,6,8 Daca a b nu poate fi 0 Daca b=2 a=1 => nr 12 Daca b=4 a=1,2,3 => nr 14, 24, 34 Daca b=6 a=1,2,3,4,5 => nr 16, 26, 36, 46, 56 Daca b=8 a=1,2,3,4,5,6,7 => nr 18, 28, 38, 48, 58, 68, 78