0
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1. 12
2. 21
3. 22
4. 23
5. 24
6. 25
7. 26
8. 27
9. 28
10. 29
11. 32
12. 42
13. 52
14. 62
15. 72
16. 82
17. 92
So 17
-2
17
-5
It would help to know which digit. 0 appears in 9 numbers and each of the others in 18 numbers.
252