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Se considera toate nr nat cuprinse intre 1 si 1000 in care 3 apare exact de două ori. Atunci nr lor este:
a) 27 b) 26 c) 30 de) 28


Răspuns :

33,133,233,303,313,323,330,331,332,334,335,336,337,338,339,343,353,363,373,383,393,433,533,633,733,833,933
R:a) 27