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Câte numere de forma a0b exista ?

Răspuns :

81 de numere naturale
Sper ca ti-am fost de folos!

101,102,103,104,105,106,107,108,109,201,203,204,205,206,207,208,209,301,302,304,305,306,307,308,309,401,402,403,405,406,407,408,409,501,502,503,504,506,507,508,509,601,602,603,604,605,607,608,609,701,702,703,704,705,706,708,709,801,802,803,804,805,806,807,809,901,902,903,904,905,906,907,908,909