Division Contest Mathematical Olympiads M 4
Olympiad , Continued4 METHOD 2: Strategy: Count by intervals, treating the 80s as a special case. Interval 1-79 80-89 90-179 180-189 190-279 280-289 290-379 380-384 # of 8s 8 119 11 911 9 5 The digit 8 appears 8 + 11 + 9 + 11 + 9 + 11 + 9 + 5 = 73 times. ...