Let's count them out...
12
20
21
22
23
24
25
26
27
28
29
32
42
52
62
72
82
92
Whew... that makes 18 two-digit numbers that have a "2".
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172
04,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94.... OR 19 Digits
17
There is only one such number.
There are 195 such numbers.