Răspuns :
PREDECESORUL NUMARUL SUCCESORUL
___________________________________________
3998 3999 4000
3999 4000 4001
5700 5701 5702
8898 8899 8900
776 777 778
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3998 3999 4000
3999 4000 4001
5700 5701 5702
8898 8899 8900
776 777 778
3398 < 3999 < 4000
3999 < 4000 < 4001
5700 < 5701 < 5702
8898 < 8899 < 8900
76 < 777 < 778
3999 < 4000 < 4001
5700 < 5701 < 5702
8898 < 8899 < 8900
76 < 777 < 778