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Cate numere pare de forma a7b in baza 10 ,sunt?

Răspuns :

45 de numere ....

a7b = 170,172,174,178,270,274,276,278,370,372,374,376,378,470,472,476,478,570,572,574,576,578,670,672,674,678,770,772,774,776,778,870,872,874,876,970,972,974,976,978. Din doi in doi ...