6, 16, 26, 36, 46, 56, 76, 86, 96 : 9 sixes
60, 61, 62, 63, 64, 65, 66, 67, 68, 69 : 11 sixes
20 sixes in the hundred between 0-99. This also applies to the hundreds starting with 100, 200, 300, 400, 500, 700, 800 and 900.
However, in the range 600 - 699, every number starts with a '6' . In the range 600 - 699 there are 100 + 20 = 120 sixes.
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