How Many Times Does The Digit 1 Occur In The Tens Place In The Numbers From 100 To 1000?
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The first ten times it occurs are in the numbers
110, 111, 112, 113, 114, 115, 116, 117, 118, 119
and the next time it occurs is in the number
210.
The last time it occurs is in the number
919.
110, 111, 112, 113, 114, 115, 116, 117, 118, 119
and the next time it occurs is in the number
210.
The last time it occurs is in the number
919.
In all, it occurs 9*10 = 90 times.
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