How many times does the digit 1 occur in a two digit number
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Answer:
It occurs 19 times, in 18 numbers.
You could solve this by sitting down and listing all the numbers with 1 in them, and it wouldn’t even take that long…
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 21
- 31
- 41
- 51
- 61
- 71
- 81
- 91
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