101~400숫자중의 2의 개수는??

일의자리(30개) : 102,112,122,132,142,152,162,172,182,192,202,212,222,232,242,252,262

272,282,292,302,312,322,332,342,352,362,372,382,392

십의자리(30개) : 120,121,122,123,124,125,126,127,128,129,220,221,222,223,224,225,226,227

228,229,320,321,322,323,324,325,326,327,328,329

백의자리(100개) : 200~299

총 : 160개