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de cate ori folosesti cifra 3,atunci cand scrii toate numerele naturale cuprinse intre 100 si 199?

Răspuns :

De 11 ori ..103,113,123,133,143,153,163,173,183,193

103,113,123,130,131,132,133,134,135,136,137,138,139,143,153,163,173,183,193
De 19 ori
Coroana?